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HA-022X Implementation of high Availability Solutions for UNIX (VCS 4.0)

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HA-022X exam Dumps Source : Implementation of high Availability Solutions for UNIX (VCS 4.0)

Test Code : HA-022X
Test cognomen : Implementation of high Availability Solutions for UNIX (VCS 4.0)
Vendor cognomen : Veritas
braindumps : 140 real Questions

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Veritas Implementation of high Availability

Carbonite and Veritas announce Reseller Partnership | killexams.com real Questions and Pass4sure dumps

nowadays, Carbonite, Inc. CARB, +1.17% a worldwide chief in information coverage, and Veritas applied sciences, a world leader in enterprise information protection and utility-described storage, announced a current partnership designed to deliver stronger endpoint outfit insurance purpose to Veritas consumers. Veritas will act as a certified distributor and reseller of Carbonite Endpoint to its consumer base.

Carbonite Endpoint is a hybrid cloud solution that safeguards the information that resides on a company’s computer systems, laptops, capsules and smartphones. the exhaust of file-stage backup with patented world deduplication, Carbonite makes it feasible for businesses’ IT managers to mitigate information loss whereas maximizing typical performance across distributed networks. Carbonite Endpoint gives a elastic and effectual information protection solution for any measurement company.

“we are very excited in regards to the prospect of working with Veritas, an extended-standing leader in business-scale facts insurance plan,” talked about Norman Guadagno, SVP advertising and marketing, Carbonite. “The endpoint is without doubt one of the most censorious vulnerabilities for organizations today, and Carbonite Endpoint has proven its potential to empower IT managers to protect agencies at scale.”

“because the statistics protection needs of groups continue to evolve, and their commercial enterprise purchasers circle to us as a trusted technology dealer and associate, they disagree with that providing a superior-in-classification endpoint insurance purpose SaaS solution is primary,” pointed out Simon Jelley, VP Product administration Veritas technologies. “With Carbonite and Carbonite Endpoint, they now Have found a associate that shares their dedication to statistics insurance purpose and a solution that meets commercial enterprise consumers’ wants.”

supplies

  • gain lore of extra about the Carbonite statistics insurance purpose Platform birthright here:Carbonite records insurance policy Platform
  • gain lore of more about the Carbonite companion application here: Carbonite accomplice program
  • About Carbonite

    Carbonite offers a robust facts insurance purpose Platform for companies, together with backup, catastrophe recovery, high availability and workload migration technology. The Carbonite statistics protection Platform supports world organizations with at ease cloud infrastructure. To gain lore of greater visitwww.Carbonite.com and celebrate us on Twitter at @Carbonite.

    About Veritas

    Veritas applied sciences is a worldwide leader in traffic facts administration – their application and solutions advocate companies protect their mission-essential statistics. Tens of thousands of agencies, together with 97% of Fortune one hundred companies, import on us day by day to back up and recover their information, preserve it relaxed and accessible, to shield in opposition t failure and obtain regulatory compliance. In today’s digital economy, Veritas gives you technology that helps companies slice back hazards and capitalize on their most censorious digital asset – their records. exist taught more atwww.veritas.comor ensue us on Twitter at@veritastechllc.

    View supply version on businesswire.com: https://www.businesswire.com/news/home/20190214005064/en/

    supply: Carbonite, Inc."> <Property FormalName="PrimaryTwitterHandle" cost="@Carbonite

    Media contacts (Carbonite) Sarah KingCarbonite617-421-5601media@carbonite.com Kelsey ShivelyWeber Shandwick (for Carbonite)425-306-2090wswnacarbonite@webershandwick.com Investor family members Contact (Carbonite):Jeremiah SisitskyCarbonite781-928-0713investor.relations@carbonite.comVeritas PR ContactUS ContactVeritas TechnologiesText 100 (For Veritas)Veritas@text100.comEMEA ContactVeritas TechnologiesJames Blamey +44 7467 688263James.blamey@veritas.comAPJ ContactVeritas TechnologiesBan Leng Neo +65 9771 3894BanLeng.neo@veritas.com

    Copyright company Wire 2019


    RFS Demonstrates end-To-end ambit Of 5G-capable options At MWC 2019 | killexams.com real Questions and Pass4sure dumps

    RFS, the international clothier and company of end-to-end solutions for instant verbal exchange, will exist showcasing its complete latitude of high performance 5G competent infrastructure at MWC 2019.

    over the last one year, RFS has labored to boost solutions to enrich the total community infrastructure for cell community traffic forward of 5G. This focus has viewed the enterprise undergo 34% increase and labor with tier one operators across the globe because it continues to design conclusion-to-conclusion solutions to remedy operator challenges.

    probably the most biggest challenges facing operators seeking to roll out 5G is the availability of device that mixes the technical performance mandatory to assist 5G, with reliability and simplicity, in a compact product contour with low visible affect. RFS is helping to handle the issue with distinct 5G-equipped options. From its ‘tremendous tiny cell’ ambit to wireless backhaul dual-band antennas, RFS is assisting operators prolong connectivity past the bottom station and penetrate dense urban areas where many 5G applications will rob a seat without massive visible influence.

    This has ended in the launch of its 5G-ready latitude; these products are specifically designed to present streamlined and future-proofed 5G options which tackle the visible, weight and space restrictions that operators Have to labor with when deploying current infrastructure. RFS has developed on its energetic Passive Antenna launch at MWC 2018 which consolidates ground station device to slice back site footprint. Optimizing the product for handy setting up with upgradable elements RFS now presents a future-proofed solution for operators. moreover, within its tiny telephone range, RFS will flaunt off the industry’s smallest tiny telephone diplexer solutions to streamline setting up and convey highest performance within the smallest feasible house.

    Herbert Merz commented, “RFS has a long legacy in designing inventive solutions to handle essentially the most pertinent issues within the telecoms trade. Their 5G portfolio has been created in response to the challenges that operators are set to mug over the next twelve months. Working closely with their OEM and operator companions, we've identified the want for ‘stealth 5G’– conclusion-to-end solutions that may furthermore exist with ease deployed and overcome the challenges operators mug around space, visual Have an outcome on and network complexity. The result is the creation of items that remedy recognized problems and should cleanly the transition to 5G for operators and their shoppers alike.”

    The items RFS will exist showcasing at MWC:

    lively Passive Antenna

  • Following the launch of the primary vigorous Passive Antenna (APA) with interleaved radiating layers for three.5GHz mMIMO by means of RFS at MWC 2018, RFS has advanced the product to handle the real-world challenges operators are dealing with with 5G rollouts. in keeping with RFS’s Platform three and Platform four passive antenna codecs which encompass low troupe (694-960 MHz), mid and extravagant troupe (1425-2690 MHz) antenna arrays and works with the APA to give the selfsame (competencies) benevolent factor whereas together with not obligatory mMIMO capabilities at 3.5 GHz. The product has been radically demonstrated and optimized to acquire inescapable the interleaving scheme doesn't affect the performance of either the vigorous or passive a portion of the antenna.
  • additionally, RFS has developed a product implementation system to acquire positive a future-proofed reply with its FUSION application. This allows for operators to set up any RFS FDD passive antenna nowadays that can seamlessly exist upgraded with lively antenna components to add TDD lively 5G mMIMO skill devoid of compromising efficiency and reducing TCO. The APA design capability valued clientele odds from a future-proofed, convenient to retain solution which permits the co-existence of 4G and 5G required in distinct markets – together with Europe, the Americas and APAC.
  • high skill 5G TDD trials are being conducted in markets around the globe the location co-existence of for case 4G and 5G could exist required – this contains Europe, India, the the united states and Asia.
  • twin troupe Antenna

  • RFS will unveil its finished twin troupe antenna options, demonstrating microwave backhaul as a attainable option to fiber to handle the calls for of 5G in urban areas. Combining extravagant capacity E-band with high availability 15GHz, 18 GHz and 23 GHz, RFS is in a position to exist positive consistent first-class of carrier over longer distances, with the skill and low latency to advocate 5G. Operators additionally improvement from a decreased TCO with subside installing fees and tower leasing charges to effortless the evolution to 5G.
  • Small cells

  • At MWC, RFS will exhibit its super tiny mobile latitude, which spans complete machine required for 5G-competent tiny cell deployments. The ambit includes everything from extremely-compact antennas to advocate 2G, 3G 4G and 5G and permit network evolution, to a brand current line of 5G-able multiplexers to give most advantageous performance within the smallest footprint accessible, to smaller benevolent element, extravagant efficiency cables and jumpers that now present a NEX10 connector alternative. The FDPL and FDPAW sequence diplexers, slightly larger than a pack of cards present the industries smallest size and weight combined with the lowest PIM, insertion loss and optimum energy dealing with to address the challenges of community densification associated with 5G.
  • In-constructing and in-tunnel cabling

  • RFS will showcase its capacity to assist with the conclusion-to-conclusion roll out of 5G with its in-building and in-tunnel options.
  • It’s flagship radiating MIMO cable which has already set the in-tunnel world record for velocity, could exist on exhibit as RFS demonstrates the applications of this and its unconditionally 5G-ready cabling solutions to deliver closing mile connectivity for operator and traffic consumers.
  • a variety of demos and options can exist showcased on hospitality stand 2LV24, corridor 2. To installation a gathering at MWC 2018 with RFS to focus on the evolution from 4G to 5G and the passage RFS can help, contact Véronique De Fournoux (veronique.de_fournoux@rfsworld.com).

    About RFSRadio Frequency programs (RFS) is a world clothier and brand of cable, antenna and tower techniques, plus lively and passive RF conditioning modules, providing complete-package options for instant infrastructure.

    RFS serves OEMs, distributors, system integrators, operators and installers within the broadcast, instant communications, land-cellular and microwave market sectors. As an ISO compliant firm with manufacturing and consumer carrier amenities that span the globe, RFS presents chopping-area engineering capabilities, superior container aid and imaginitive product design. RFS is a leader in instant infrastructure.

    For extra assistance, contend with www.rfsworld.com.


    “State of the Hybrid Cloud” research Suggests IT professionals should focus on counsel management – no longer Infrastructure | killexams.com real Questions and Pass4sure dumps

    MOUNTAIN VIEW, Calif.--(company WIRE)--Veritas technologies, the leader in suggestions administration, today introduced the consequences of a worldwide survey indicating that nearly three-quarters of agencies continue to undertake distinctive inner most and public cloud recommendations. The findings highlight the want for corporations to undertake solid suggestions management and safety techniques.

    The examine, commissioned with the aid of Veritas and performed through Cicero group, surveyed 1,800 global IT determination makers in agencies with at least 500+ employees and at least 75TB of statistics below management. overall, the analysis printed that enterprise-important workloads within the public cloud are set to double in the subsequent 24 months – roughly the identical fee as non-crucial workloads – placing drive on IT departments to acquire inescapable their complete traffic services, no longer simply their infrastructure, are enormously accessible and comfy.

    The anatomize examined both the charge at which agencies are stirring records to the cloud, utilizing each inner most and public cloud functions, as smartly as the reasoning at the back of their decisions. The analysis furthermore appears to disprove some commonplace perceptions about cloud adoption. as an instance, one traditional view is that less valuable workloads will migrate to the public cloud first and at a quicker cost. whereas this may additionally Have been the case early on, the notice at discovered that here is shifting: enterprise-vital workloads including CRM and ERP are relocating to the cloud at the selfsame prices statistically – from 25-30% -- as different, less crucial workloads. whereas these findings point out an extended Have self-possession in stirring facts of complete types to the cloud, it additionally translates to delivered drive for carrier suppliers to acquire positive extravagant availability and avoid downtime, in addition to challenges IT departments to Have the birthright information insurance purpose recommendations in location that can span heterogeneous infrastructure – on and off premise.

    Key findings of the study encompass birthright here:

  • 38% of workloads nowadays exist in a private cloud, with 28% in a public cloud. although, these numbers are anticipated to grow at rates of 7% and 18%, respectively, over the next twelve months.
  • 74% of firms are at the moment leveraging two or greater cloud infrastructure providers to assist their workload requirements and 23% are the exhaust of 4 or extra vendors. This capability that the trial of keeping, managing and applying the statistics throughout these heterogeneous environments will plunge mostly on IT departments.
  • Geographically, Japan and Brazil paved the passage in leveraging the generic public cloud with roughly 50% greater workloads relocating to the generic public cloud than the U.S., Canada, France and Germany.
  • When examined via business, manufacturing led the manner in migration to the generic public cloud with 30% of their workloads in the public cloud, as in comparison to 24% in telecommunications, 23% in both healthcare and monetary and sixteen% within the public sector.
  • multiple-third of respondents said that saturate is the fundamental driver for relocating to the generic public cloud, whereas the equable inhibitor to public cloud exhaust remains safety, with 50% reporting that security/insurance policy architectures remains the precise explanation for heading off the public cloud. interestingly, of folks that Have adopted public cloud, security changed into the accurate driver of pride with their determination, highlighting, perhaps, that public cloud carriers deserve to enhanced articulate and promote their protection capabilities and successes.
  • A titanic variety of respondents referred to that determined workloads would at complete times abide on-premises in location of migrating to the cloud. for instance, 28% status that backup and healing will continue to exist on-premises, 27% will hold catastrophe recuperation out of the cloud and 26% will continue to condominium archive, records warehousing and relational or OLTP databases on-premises.
  • 81% of companies depend on provider suppliers for advocate with cloud implementation, as well as ongoing operations, indicating that the heterogeneous and “messy” nature of cloud will continue to exist a challenge for IT departments, and repair suppliers with extravagant levels of succor and abilities will exist helpful to companies, mainly as they migrate workloads to the public cloud.
  • “This research underlines the existing status of the hybrid cloud world,” mentioned Simon Jelley, Veritas VP of Product administration, Veritas applied sciences. “This world is greater – not less – heterogeneous, which could imply increasing complexity from an counsel management perspective. corporations must exist extra vigilant than ever in picking out IT blind spots and expertise safety risks to avoid unplanned downtime or an assistance crisis.”

    The finished “State of the Hybrid Cloud” file can furthermore exist downloaded here.

    About Veritas technologies

    Veritas applied sciences enables companies to harness the power of their information, with information management options serving the realm’s largest and most knotty environments. Veritas works with organizations of complete sizes, including 86 p.c of world Fortune 500 organizations, improving records availability and revealing insights to pressure aggressive knowledge. www.veritas.com

    Veritas, the Veritas logo, NetBackup, and Backup Exec are emblems or registered logos of Veritas technologies LLC or its affiliates in the U.S. and different countries. different names may exist trademarks of their respective house owners.


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    EMC and Microsoft contour Strategic Global Alliance | killexams.com real questions and Pass4sure dumps

    HOPKINTON, Mass., and REDMOND, Wash., Feb. 1, 2000 — EMC Corp. and Microsoft Corp. today announced a strategic alliance designed to succor organizations worldwide more effectively build and deploy highly reliable, available and manageable traffic solutions using the Microsoft® Windows® 2000 Server network operating system. The companies will combine Windows 2000, leading storage solutions and services from EMC, along with end-to-end solutions and services from EMC’s Data generic division to address the computing requirements of customers with the most demanding information technology environments.

    As portion of the alliance, Data generic is offering the industry’s first 99.9 percent uptime service guarantee for Windows 2000, enhancing its high-availability solutions for customers running their mission-critical operations on Microsoft enterprise platforms. This uptime service guarantee will cover clustered Data generic servers running Windows 2000 Advanced Server or Windows 2000 Data heart Server, when available.

    In addition, EMC today announced it is a Windows 2000 Global Launch colleague and will combine Microsoft in more than 60 locations worldwide on Feb. 17, 2000, with other industry leaders showcasing significant investments in the Windows 2000 family of operating systems through solutions, services and support.

    Initially, the global alliance will focus on the following:

  • To succor customers migrate to Windows 2000 while managing, sharing and protecting their enterprisewide information, the companies will develop and market storage networking solutions for the Windows NT® Server and Windows 2000 operating systems using EMC storage systems and software.

  • To provide highly available, manageable information infrastructures that simplify the customer experience, the companies will deliver a suite of packaged, end-to-end solutions combining Data General’s“In-a-Box”products, Cluster-in-a-Box , Exchange-in-a-Box and TermServer-in-a-Box ; lifecycle services, including a 99.9 percent uptime service guarantee for Windows 2000, Windows NT Server 4.0, Exchange Server and SQL Server TM 7.0; and fixed priced advocate and training for high-availability platforms delivered through Data General’s Microsoft Certified advocate Center.

  • To enable customers to upgrade easily from Microsoft Exchange Server 5.5 toExchange 2000 Server and establish highly available, scalable and manageable Exchange messaging and collaboration environments, the companies will develop and market integrated solutions using servers and services from Data generic as well as EMC’s storage solutions and services.

  • To meet the unique, mission-critical requirements of the health-care market, Data generic and Microsoft will drive the adoption of and migration to Windows 2000 Server-based solutions for hospitals, managed-care providers and physician offices.

  • “HomeLife embarked on an early deployment of Windows 2000 in an ambitious project to reinvent their entire IT infrastructure,”said Christopher Smith, chief information officer for HomeLife, formerly the furniture division of Sears, Roebuck and Co. and one of the largest furniture retailers in the United States.“Because of the successful working relationship between Microsoft, Data generic and EMC, they Have already started to observe the high-availability, reliability and manageability benefits of their implementation. They Have been impressed by the consistent even of cooperation, dedication and advocate they Have received and believe that this alliance will afford even more opportunities for us to ensure the future success of their traffic solutions.”

    To advocate the initiatives of the alliance, the companies Have invested funds for joint marketing, certification and training on Microsoft technologies. EMC and Data generic will train and certify 400 professionals as Microsoft Certified Solution Developers and Microsoft Certified Systems Engineers in the next 12 months. Data generic has established Microsoft-focused Solution Centers that will exist used to develop, deliver and advocate Microsoft-based traffic solutions and to demonstrate the scalability, manageability, interoperability and traffic value of the Microsoft platform.

    In addition, EMC’s Data generic division will provide global advocate to customers 24 hours a day, seven days a week, including solutions development in its target markets. Data generic will engage Microsoft Premier advocate Services to assist in providing this even of service for enterprise customers.

    Roy Sanford, EMC’s vice president of Enterprise Alliances, said,“The rapid growth of Windows-based information and the increased reliance on these systems for mission-critical applications is driving customer requirements for more effectual ways to manage, participate and protect that information. This alliance is a commitment by both companies to providing customers around the world with the most advanced storage systems and software to meet those requirements.”

    “Customers are looking for end-to-end solutions that ensure the rapid and dependable deployment of Windows 2000 and other emerging technologies designed to succumb breakthroughs in value,”said Deborah Willingham, vice president of Windows Marketing at Microsoft.“Microsoft, EMC and Data generic Have worked together for several years on enterprise customer and technology-related initiatives. They are convinced that the depth of undergo shared by their companies will enable their customers to implement enterprise solutions with self-possession to realize significant traffic value quickly.”

    “We are delighted to team with Microsoft to acquire this groundbreaking announcement,”said Bob Dutkowsky, president of EMC’s Data generic division.“We believe that this unique combination of dedicated expertise will enable businesses to dramatically reduce the complexity and deployment time of highly available, high-performance Microsoft solutions throughout the enterprise. In addition, they are confident that this agreement will further their vision of a consolidated, simplified and controlled computing infrastructure for the enterprise.”

    About EMC

    EMC Corp., a Fortune 500 company based in Hopkinton, Mass., is the world’s technology and market leader in the rapidly growing market for knowing enterprise storage systems, software, networks and services. The company’s products store, retrieve, manage, protect and participate information from complete major computing environments, including Windows NT, Windows 2000, UNIX, Linux, mainframe and other platforms. The company has offices worldwide, trades on the current York Stock Exchange under the symbol EMC, and is a component of the S & P 500 Index. For further information about EMC and its storage solutions, EMC’s corporate Web site can exist accessed at http://www.emc.com/ .

    Data General, a division of EMC, is a major supplier of consolidated computing solutions for customers worldwide. The division’s products embrace Microsoft Windows NT, Windows 2000- and UNIX-based AViiON &#210; servers and related software and services. Strategic alliances with leading software vendors and systems integrators enable Data generic to deliver complete solutions that meet customers’ traffic need to simplify, consolidate and control information technology infrastructures. Additional information on Data General, its products and services is available on the Internet at http://www.dg.com/ .

    About Microsoft

    Founded in 1975, Microsoft (Nasdaq“MSFT”) is the worldwide leader in software for personal and traffic computing. The company offers a wide ambit of products and services designed to empower people through Great software – any time, any location and on any device.

    EMC and Data generic are registered trademarks of EMC Corp. AviiON, Cluster-in-a-Box and Exchange-in-a-Box are registered trademarks, and TermServer-in-a-Box is a trademark of Data General, a division of EMC.

    Microsoft, Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corp. in the United States and/or other countries.

    All other brand names and product names referenced in this press release are trademarks or registered trademarks of their respective holders.

    This release contains“forward-looking statements”as defined under the Federal Securities Laws. Actual results could disagree materially from those projected in the forward-looking statements as a result of inescapable risk factors, including but not limited to: (i) component character and availability; (ii) delays in the development of current technology and the transition to current products; (iii) competitive factors, including, but not limited to, pricing pressures in the computer storage and server markets; (iv) the relative and varying rates of product charge and component cost declines; (v) economic trends in various geographic markets and fluctuating currency exchange rates; (vi) deterioration or termination of the agreements with inescapable of the company’s resellers or OEMs; (vii) the uneven pattern of quarterly sales; (viii) risks associated with strategic investments and acquisitions; (ix) year 2000 issues; and (x) other one-time events and other valuable factors disclosed previously and from time to time in EMC’s filings with the U.S. Securities and Exchange Commission.

    Note to editors: If you are interested in viewing additional information on Microsoft, gratify visit the Microsoft Web page at http://www.microsoft.com/presspass/ on Microsoft’s corporate information pages.


    Implementing SQL Server AlwaysOn Availability Groups on ECS Instances | killexams.com real questions and Pass4sure dumps

    Introduction

    SQL Server is an open-source relational database management system (RDBMS). Its primary office is to store and retrieve data when required by other applications. It runs on various operating systems, such as Linux, UNIX, and Windows and across a wide ambit of applications.

    The SQL Server AlwaysOn feature was made available in the SQL Server 2012 release. The AlwaysOn availability group boasts of a high-availability and catastrophe recovery solution. It replaces enterprise-level database image solutions to maximize the availability of a set of user databases for the enterprise. This feature sparked a revolutionary change in the industry.

    The solution implements multiple readable copies as well as convenient read and write separation schemes. It outperforms Database Mirroring + Replication for achieving read and write separation with respect to availability and reliability. Several features may Have restrictions in versions earlier than SQL Server 2016. However, post release of the 2016 version, SQL Server became more user-friendly and compliant with the “customer first” principle. For example, you can now achieve no-domain-control deployment and relish as many as nine available copies.

    Alibaba Cloud ECS Instances

    The Alibaba Cloud ECS allows you to load applications with multiple operating systems and manage network access rights and permissions. Within the user console, you can furthermore access the latest storage features, including auto snapshots, which is consummate for testing current tasks or operating systems as it allows you to acquire a quick copy and restore later. It offers a variety of configurable CPU, memory, data disk and bandwidth variations allowing you to tailor each Instance to your specific needs.

    Let us observe how to implement AlwaysOn availability groups with no domain control on Alibaba Cloud ECS instances.

    1. Prerequisites

    Before they commence detailing the architecture solution, let us notice at the prerequisites for the deployment process.

    1.1 Hardware Conditions:

    Container ECS: Recommended: 4-core CPU or above, 8GB reminiscence or above. Mount SSD cloud disks as ECS.

    1.2 Software conditions:

    You would need the following software with the listed specifications:

    ● .NET Framework 4.0 or above● Powershell 5.0 or above● Windows Server 2016 64-bit Data heart Edition (either Chinese or English edition)● SQL Server 2016 64-bit Enterprise Edition (It requires Enterprise Edition. measure Edition can only implement Basic Availability)

    Architecture Diagram

    The following figure shows the simple architecture of implementation on ECS instances. It furthermore demonstrates a typical software solution for SQL Server AlwaysOn availability groups.

    Figure 1.

    Overview of Core Components

    Let us now contend the core components of the solution.

    1. Architecture Overview

    The figure shows a “2 + 3” high-availability and disaster-tolerant solution. The “2” refers to primary and secondary database copies. These primary and secondary databases exhaust sync mode to enable automatic failover between availability groups of the database. The condition for automatic failover is such that the server must utilize the synchronous replication mode. Also, the databases must Have automatic failover settings enabled.

    The “3” refers to read-only copies that exhaust async, or asynchronous replication mode, which takes into account the performance of multiple copies. For writing data, two copies (primary and secondary) are adequate. You can set complete other copies to asynchronous replication. Additionally, there is an access issue to consider for ECS to deploy listeners. Therefore, to meet the solution requirements, the server allows only two synchronous copies. In fact, AlwaysOn availability group can only Have up to three synchronous copies, which is enough to prove that Microsoft cares about this performance problem quite a bit.

    2. Virtual Private Cloud (VPC)

    Being VPC-based is an underlying network environment requirement. If you deploy databases in a classic network, you will hasten into grave issues due to the absence of Intranet IP addresses. However, if it is a VPC, resolving the problem is possible. AlwaysOn deployment will produce two virtual IP addresses. As a result, the two IP addresses must exist private and remain unoccupied. Otherwise, the cluster and the listener may fail to labor normally, and HA switch won’t office properly.

    3. Highly Available (HA)

    Users might often ask, why Do they need HA? If you deploy AlwaysOn on ECS instances, you may hasten into listener failures.

    The inability to exhaust the listener IP address to access database instances from a non-primary node causes listener failure. The listener failure is an snag preventing cloudization. In fact, it is associated with VPC network implementation. While the listener happens to rob the Address Resolution Protocol (ARP) protocol, its resolution is not possible. HAVIP (Highly Available Virtual IP) is an HA solution with primary-secondary high-availability architecture under VPC. It provides the capability to access instances using VIP (Virtual IP) between primary and secondary instances without switching the IP address. However, you need to implement HA and heartbeat check on your own. This coincides with AlwaysOn’s failover detection, diagnosis and switch mechanisms.

    Furthermore, HAVIP + AlwaysOn can solve problems caused by listener failures. However, the system allows HAVIP to exhaust only two nodes.

    We exhaust two synchronous nodes (primary and secondary) to implement write HA. Also, they exhaust three asynchronous read-only copies to implement reads, which fits into this scenario appropriately. The number of read-only copies may vary from one to two or further to seven. However, the number of nodes available for failover must allow votes of greater than or equal to three (nodes with domain control can exhaust the shared folder to act as a VOTE).

    This may give ascend to the question — How can they access so many read-only copies? Read further for an reply to this question.

    4. Server Load Balancer

    Server Load Balancer is designed to address read-only nodes. Ideally, this applies if you Do not need Server Load Balancer to assign weights or implement load balancing automatically. You can furthermore directly connect to the IP addresses of read-only copies. This is particularly in the case of deployment of web apps in a distributed approach. Therefore, it is feasible to connect different web apps to different read-only nodes. Nodes for writes are restricted to Do this as write nodes only Have one copy.

    5. Elastic IP Address (EIP)

    An Elastic IP address is a public IPv4 address designed for dynamic cloud computing. Using an EIP, users can mask the failure of an instance or software. However, in this scenario, an EIP is not necessary. If you want to access database instances from outside the VPC, you can bind an EIP to an HAVIP and an ECS IP address. Note that it is impossible to bind Server Load Balancer to EIP. They Do not recommend EIP since access in VPC is relatively safe.

    6. Elastic Compute Service (ECS)

    Elastic Compute Service (ECS) is a core service that enables users to launch current instances immediately to meet with real-time demand. ECS is the most basic instance with no special requirements.

    7. Windows Cluster

    Windows Cluster is crucial to this solution because operations for creating clusters for nodes with no domain control are often different. Also, DNS servers may even exist absent. This is a current feature of Windows Server 2016. It brings with itself the odds of independence from the complexity of domain control. Additionally, it furthermore adds complexity to AlwaysOn deployment. Domain control not only has to consider deployment and HA problems but furthermore needs to consider O&M issues, which often is a bother. Windows Cluster with no domain control, despite limited functionality, is adequate to meet conditions for deploying AlwaysOn. You can mention to the deployment plan, discussed further in this article, for more details.

    8. AlwaysOn Availability Group

    AlwaysOn deployment uses SQL Server 2016 since this version supports non-domain-control deployment. The contrast lies in whether domain control exists. While the security authentication modes of corresponding nodes will change — mutual authentication is required using security certificates.

    Domain control is fairly straightforward, relying on the security authentication mechanism. The complexity of deployment manifests the same. Another factor that is worth mentioning is the listener, which cannot normally office in a VPC. Therefore, implementation of read and write separation requires HAVIP along with Server Load Balancer. Listener access to database instances is not a very elegant issue. If it is read-only access, there will exist a read-only option on the connection string. This might confuse you in considering read and write as two different strings.

    Similar to HAVIP + Server Load Balancer, many may mistakenly assume that a string solves the problem. However, it is practically impossible.

    Let us now notice into the deployment plan.

    Deployment Plan

    The following section describes the deployment of a stand-alone Windows Server 2016 + SQL Server 2016 environment systematically.

    Before you commence the deployment, it is necessary that you Have the following as prerequisites.

    1. Prerequisites 1.1 Hardware Conditions:

    Container ECS: Recommended: 4-core CPU or above, 8GB reminiscence or above. Mount SSD cloud disks as ECS.

    1.2 Software conditions:

    You would need the following software with the listed specifications:

    ● .NET Framework 4.0 or above● Powershell 5.0 or above● Windows Server 2016 64-bit Data heart Edition (either Chinese or English edition)● SQL Server 2016 64-bit Enterprise Edition (It requires Enterprise Edition. measure Edition can only implement Basic Availability)

    1.3 Network requirements

    Users must remember that AlwaysOn does not need dual NICs. Dual NICs cannot enable divide network connections of Windows Cluster and AlwaysOn. Some customers require dual NICs for the sake of heartbeat, which is unnecessary. Dual NICs can better redundancy but not for heartbeat.

    1.4 Demo Environment

    The demo environment should fulfill the following prerequisites:

    ● .NET Framework 4.0 ● Powershell 5.1 ● Windows Server 2016 64-bit English Data heart Edition ● SQL Server 2016 64-bit English Enterprise Edition + SP1 ● ECS based on VPC ● High-performance SSD cloud disks

    Once you are positive of satisfying the prerequisites, you can whisk forward with preparing an environment for deployment.

    2. Prepare Environment for Deployment

    Firstly, apply for an ECS type. You must remember that the recommended reminiscence is 8GB or above, the CPU is 4-core or above and the demo environment is 2-core CPU, 4GB memory. The network nature must exist VPC.

    3. Modify the Host Name

    Since images produce ECS instances, some of them may participate the selfsame name. While this problem is rare in VPC, to ensure absolute security, modify the host cognomen to shorter than 15 characters and immediately restart the host. You can furthermore manually alter the cognomen by referring to the Powershell command, which is as follows:

    Rename-Computer -NewName “ServerName” -restart -force

    4. Install SQL Server Instances

    During installation, pay attention to setting a reasonable launching account, which can exist a network service or a local account. However, if you exhaust a local account, you need to set a uniform password for each ECS instance. They recommend you exhaust a network service. After the installation is complete, add the network service to the SQL Server account, and set the server role to sysadmin. Additionally, maintain plenary consistency between at least the user database and the log file path of each ECS installation instance. Note that this is necessary for AlwaysOn deployment. Otherwise, an oversight may occur later during database creation. They recommend that complete installation actions exist consistent, as it is a best practice. You can click Next Step or exhaust default installation for installing databases.

    5. Install SQL Server Management Studio

    Moving to the next step, they imply you install SQL Server Management Studio (SSMS). SSMS in SQL Server 2016 is available for independent installation. The uniform engine installer does not embrace the SSMS, and hence you need to download it separately. The judgement for installing SSMS is that you may need SQLPS (SQL Powershell).

    6. Create a Unified Windows Account

    Since this solution is not a stand-alone solution, you need to add an account with the selfsame account cognomen and password to ensure successful deployment of Windows Cluster and add the account to the administrators’ group. You can exhaust administrator; however as a best practice, Do not exhaust it as the unified password. You can create it manually, or exhaust the following cmd command:

    net user Win_Account " xxxxxx" /addnet localgroup administrators Win_Account /addWMIC.EXE Path Win32_UserAccount Where Name="Win_Account" Set PasswordExpires="FALSE" 7. Disable UAC Remote Restrictions

    You can disable the UAC remote restrictions using the following:

    Powershell command: new-itemproperty -path HKLM:SOFTWAREMicrosoftWindowsCurrentVersionPoliciesSystem -Name LocalAccountTokenFilterPolicy -Value 1

    8. Install Windows Failover Cluster Feature

    This is a mandatory and basic structure. AlwaysOn must grow on the Windows Cluster. Powershell command:

    Install-WindowsFeature –Name Failover-Clustering –IncludeManagementTools

    9. Modify the DNS Suffix of a Windows Host

    This solution involves a stand-alone control. To acquire the solution successfully hasten under Windows Cluster, you need to add the uniform suffix to the hostname for identification purposes. You can modify it through the UI, or exhaust the Powershell command:

    $ParentKeyPath = "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters"$DnsSuffix="aliyunrds.com"New-ItemProperty -Path $ParentKeyPath -Name "NV Domain" -Value $DnsSuffix -PropertyType String 10. Change the Host’s Static IP Address

    Strictly speaking, you can start to exhaust DHCP for configuration starting from Windows Server 2008. However, they imply you exhaust a static IP address to configure the host’s network connection. You can exhaust the UI or the Powershell command for configuration. However, remember to check the DNS configuration and adjust it as necessary. Modify the script on your own or you can adjust it manually. You can Do that by using the following:

    $IPType = "IPv4" $Adapter = Get-NetAdapter | Where-Object {$_.Status -eq 'up' -and $_.name -ne 'loopback'} $IpAddress=((($Adapter | Get-NetIPConfiguration).IPv4Address) | Where InterfaceAlias -ne "loopback").IPAddress$PrefixLength=((($Adapter | Get-NetIPConfiguration).IPv4Address) | Where InterfaceAlias -ne "loopback").PrefixLength$Gateway=((Get-NetIPConfiguration).Ipv4DefaultGateway).NextHop If (($adapter | Get-NetIPConfiguration).IPv4Address.IPAddress) {$adapter | Remove-NetIPAddress -AddressFamily $IPType -Confirm:$false} If (($adapter | Get-NetIPConfiguration).Ipv4DefaultGateway) {$adapter | Remove-NetRoute -AddressFamily $IPType -Confirm:$false} # config static ip address$Adapter | New-NetIPAddress -AddressFamily $IPType -PrefixLength $PrefixLength -IPAddress $IpAddress -DefaultGateway $Gateway 11. Modify the Host’s Hosts File

    The file is located at hosts under C:WindowsSystem32driversetc. You need to map the cognomen and DNS suffix of every host along with the IP addresses. You can complete this with the cmd command:

    copy C:\Windows\System32\drivers\etc\hosts C:\Windows\System32\drivers\etc\hosts_2017033141131echo 172.16.18.247 iZbp1ehi2dopyqC.aliyunrds.com >> C:\Windows\System32\drivers\etc\hostsecho 172.16.18.246 iZbp1ehi2dopyqZ.aliyunrds.com >> C:\Windows\System32\drivers\etc\hostsecho 172.16.18.248 iZbp1ehi2dopyqA.aliyunrds.com >> C:\Windows\System32\drivers\etc\hosts 12. Create Windows Cluster

    The next step involves creating the windows cluster. The latest version of Windows Server 2016 supports cluster creation through UI, but you can furthermore choose to create the cluster through the Powershell command. You need to specify staticAddress, which is the IP address in the VPC. exist heedful not to occupy it:

    New-Cluster –Name clus-aliyun0001 -Node iZbp1ehi2dopyqC.aliyunrds.com,iZbp1ehi2dopyqZ.aliyunrds.com,iZbp1ehi2dopyqA.aliyunrds.com -AdministrativeAccessPoint DNS -StaticAddress 172.16.18.101

    13. Set Arbitration Mechanism for Windows Cluster

    Non-domain-control AlwaysOn availability groups only advocate arbitration through majority nodes or based on Microsoft cloud files. Alibaba Cloud only supports the majority nodes mode. As a result, you Have to deploy at least three nodes for your Windows Cluster. If you deploy four nodes, acquire positive to set one of them to zero voting rights. If you only need two database copies, you can exhaust two ECS instances, with one serving as an AlwaysOn node and the other only joining the Windows Cluster.

    Set VOTE: $node = "Always OnSrv1" (Get-ClusterNode $node).NodeWeight = 0 Set no-witness: Set-ClusterQuorum -NoWitness Set majority-node arbitration: Set-ClusterQuorum –NodeMajority 14. Set Interval of Windows Cluster Failovers

    You may celebrate in your testing process that after several failovers, automatic failover ceases to office after some time. This is because Windows Cluster imposes a restrict on the number of automatic failovers for each resource group within a inescapable period. If you want to increase the restrict of automatic failovers to, yelp 30 failovers, exhaust the following command.

    (Get-ClusterGroup “Cluster Group”).FailoverThreshold = 30

    15. Enable the Database AlwaysOn Feature

    You must enable the database AlwaysOn feature. Below is an image for your reference.

    Figure 2.

    Import-Module SQLPSEnable-SqlAlwaysOn -Path SQLSERVER:SQLLocalHostDefault -Force

    16. Configure AlwaysOn Security Settings

    To Do this, you need to create complete the instance certificates first, then copy them to the directory of each ECS instance and then rerun them. For example, you Have three host instances 001, 002 and 003.

    ● On Instance 001, you need to create the certificates backed up from Instance 002 and Instance 003.● On Instance 002, you need to create the certificates backed up from Instance 001 and Instance 003. ● Similarly, on Instance 003, you need to re-create the certificates of Instance 001 and Instance 002. Instances must authenticate each other to communicate.

    Below are the steps of the SQL statements:

    Step 1

    CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'xxxxxx' CREATE CERTIFICATE cer_alwayson_001WITH SUBJECT='alwayson 001 local certificate',EXPIRY_DATE='9999-12-31' EXEC xp_create_subdir 'C:\software\cerficates' BACKUP CERTIFICATE cer_alwayson_001TO FILE='C:\software\cerficates\cer_alwayson_001.cer' CREATE ENDPOINT Endpoint_MirroringSTATE = STARTEDAS TCP (LISTENER_PORT = 5022, LISTENER_IP = ALL)FOR DATABASE_MIRRORING (AUTHENTICATION = CERTIFICATE cer_alwayson_001, ENCRYPTION = REQUIRED ALGORITHM AES, ROLE = ALL)

    Step 2

    CREATE LOGIN alwayson_user WITH PASSWORD='xxxxxx',CHECK_POLICY=OFF USE MASTERGOCREATE USER alwayson_user FOR LOGIN alwayson_user

    Step 3

    : create trusted certificate /* To Do this, you need to create complete the instance certificates first, and then copy them to the directories of each ECS instance and then rerun them. For example, on Instance 001, you need to create the certificates backed up from Instance 002 and Instance 003. On Instance 002, you need to create the certificates backed up from Instance 001 and Instance 003. Similarly, on Instance 003, you need to re-create the certificates of Instance 001 and Instance 002. */

    CREATE CERTIFICATE cer_alwayson_002 AUTHORIZATION alwayson_userFROM FILE=’C:softwarecerficatescer_alwayson_002.cer’

    CREATE CERTIFICATE cer_alwayson_003 AUTHORIZATION alwayson_userFROM FILE=’C:softwarecerficatescer_alwayson_003.cer’

    — step4:grant connection rightGRANT CONNECT ON ENDPOINT:: Endpoint_Mirroring TO alwayson_user

    17. Create a Database on the Instance and acquire a Full Backup

    The system creates a database that is imperative for creating AG later. The Backup is necessary for copy replication because you will exist unable to establish copy replication without a transaction log point.

    Use the following command for the same:

    CREATE DATABASE rdsystemBACKUP DATABASE rdsystem TO DISK=’C:softwarerdsystem.bak.full.first’

    18. Create AG on the Primary Copy

    Once the creation of the database commences, you now Have to create the AG on the primary copy. They recommend beginners create AG using the UI because the wizard facilitates the creation. Then ensue the prompted instructions. Below are some screenshots for your reference.

    Figure 3.

    You can furthermore exhaust the SQL commands:

    CREATE AVAILABILITY GROUP [ag-aliyun0001]WITH (AUTOMATED_BACKUP_PREFERENCE = SECONDARY,DB_FAILOVER = OFF,DTC_SUPPORT = NONE)FOR DATABASE [db1]REPLICA ON N'IZBP1EHI2DOPYQA' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqA.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),N'IZBP1EHI2DOPYQC' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqC.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),N'iZbp1ehi2dopyqZ' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqZ.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL));

    If you need to restore the database to a secondary copy manually, backup the database and logs, and then restore the secondary copy to the “roll forward” state. Alternatively, you can participate a folder and allow the wizard to complete the process. Finally, they recommend a system for creating AG. Add the SEEDING_MODE = AUTOMATIC option to each copy of the above script, specifically:

    N'iZbp1ehi2dopyqZ' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqZ.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50,SEEDING_MODE = AUTOMATIC, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL))Then hasten the following command on each secondary copy node: SECONDARY ALTER AVAILABILITY GROUP [ag-aliyun0001] grant CREATE ANY DATABASE 19. Add AG to the Secondary Copy and Add the Database

    To add AG to the secondary copy and add the database using the following command:

    ALTER AVAILABILITY GROUP [ag-aliyun0001] JOIN;ALTER DATABASE [db1] SET HADR AVAILABILITY GROUP = [ag-aliyun0001];

    20. Create a Listener

    The access to A created listener is not feasible from external non-primary nodes, but you can exhaust HAVIP to solve this problem. Just exhaust the UI to create it and select Next Step directly. The screenshot below should act as a reference.

    Figure 4.

    At this point, an AlwaysOn availability group has completed creation. They would request you to Have a notice at the three figures again. You will notice that they are captured from different copies. portion of their content is different, distinguishing the primary copy and the secondary copy, as well as the synchronous and asynchronous replication relationships. Below are the three screenshots for your reference.

    Figure 5.

    Figure 6.

    Figure 7.

    Let us now proceed to create HAVIP

    21. Create HAVIP

    Consult the VPC/HAVIP product manager to activate the HAVIP whitelist and then associate it with the two synchronized ECS instances in the console. Note that the ECS instances must exist the ones for synchronously replicated database copies. HAVIP must exist consistent with the listener IP address and the listening port must exist consistent with the listener port.

    22. Create a Read-Only Server Load Balancer

    This is very simple. Just bind the read-only ECS instance to the Server Load Balancer and specify the weight.

    This concludes their list of steps involved in the deployment of a stand-alone Windows Server 2016 + SQL Server 2016 environment. They will now whisk towards understanding the precautions that users must ensue during the entire deployment process.

    Precautions to exist Followed During Deployment

    ● There is no domain control in this solution; hence there are numerous security requirements on configuration;● If you need to enable domain control, AlwaysOn security configuration will no longer exist required;● The solution is a beta of a productized solution, with the product scheduled for launch in the near future. The productized solution will Have some license limitations with high automation competency. It will exist a PaaS service.

    Conclusion:

    This article primarily focuses on the deployment of SQL Server 2016 that offers dual master and multiple read replicas. The AlwaysOn group boasts of a high-availability and catastrophe recovery solution. They discussed the prerequisites that one needs to Have in location before embarking on the deployment process. The steps involved in the deployment are a set of 22 steps that users must follow. Users must rob note of the contrast in distinguishing the primary copy from the secondary copy, as well as the synchronous and asynchronous replication relationships.

    Reference:

    https://www.alibabacloud.com/blog/Implementing-SQL-Server-AlwaysOn-Availability-Groups-on-ECS-Instances_p378984?spm=a2c41.11187604.0.0


    Network Design Strategies | killexams.com real questions and Pass4sure dumps

    This chapter, from Upgrading and Repairing Networks, 5e, looks at the network's logical and physical design to assist your planning when creating a current network.

    This chapter is from the engage 

    Many types of networks were discussed in Chapter 1, "A Short History of Computer Networking," from ARPANET to TCP/IP. And in Chapter 2, "Overview of Network Topologies," you erudite about the various topologies you can employ when designing and creating a local area network (LAN), and they furthermore looked at some scenarios in which several networks were connected to contour a wide area network (WAN). In this chapter, they will notice at another aspect of creating a network: the network's logical and physical design. The physical aspects of your LAN will depend on the underlying physical transport technology—Ethernet or Token-Ring, for example, or possibly ATM, which is supported as a LAN protocol in products such as Windows 2000/XP, Windows Server 2003, and Linux. Depending on which technology you use, there will exist one or more LAN topologies from which to choose.

    Before you can commence to design a physical network, however, you first must determine your needs. What services must you provide to your user community? What are the resources you'll need? If you Have to compromise, what will it rob to meet the most users or to provide the more valuable services? You then will Have to rob into account network protocols, applications, network speed, and, most important, network security issues; each of these figures into a network's logical design. Another valuable factor your management will probably force you to consider is cost—you can't forget the budget. These factors acquire up the logical design for your network. You first should resolve what you need and what it will rob to provide for those needs.

    If you are creating a current network and purchasing current applications, you will probably spend most of your time considering the licensing and other monetary costs (training users, network personnel, and so on). If you are upgrading older applications, several other factors Come into consideration. Many applications that were coded using COBOL, BASIC, FORTRAN, and other languages that helped jumpstart the computer age may Have built-in network functionality based on older proprietary network protocols. If this is the case with your network, you Have to consider several things. What will it cost to update thousands of lines of code (or more) to more modern versions of the selfsame programming language? What will it cost to upgrade these programs to newer object-oriented languages? To reclaim money, can you upgrade portion of your network and exhaust gateway hardware/software to connect to older network components?

    Because of the costs associated with coding applications that were created many years ago, and the expenses that will exist required to update them to modern programming languages, you may exist forced to maintain legacy applications for a few years while replacement applications are designed and created. You may find a packaged application that can exist used to replace older programs. This problem will apply mostly to proprietary computer architectures, instead of Windows or Unix platforms. If you can simply acquire minor changes and compile the source code so that it will hasten on a newer operating system, your costs will exist much less than if you Have to re-create the applications your users need from scratch. Another cost associated with upgrading to current programs is training users and help-desk personnel.

    When you purpose a logical network design, you can start from one of two places. You can design and install a current network from scratch, or you can upgrade an existing network. Either way, you should congregate information about several valuable factors before you commence the logical design. For example, depending on the services that will exist provided to clients, you might need to anatomize the feasible traffic patterns that might result from your plan. Locate potential bottlenecks and, where possible, alleviate them by providing multiple paths to resources or by putting up servers that provide replicas of valuable data so that load balancing can exist provided. The following are other factors to consider:

  • Who are the clients? What are their actual needs? How Have you determined these needs—from user complaints or from help-desk statistics? Is this data reliable?
  • What kinds of services will you provide on the network? Are they limited in scope? Will any involve configuring a firewall between LANs? And if so, that still doesn't account for configuring a firewall to enable access to the Internet.
  • Will you need to allow an Internet connection for just your internal network's users, or will exhaust you need to allow outside vendors access to your network? One case that comes to mind is the Internet Printing Protocol (see Chapter 24, "Overview of the TCP/IP Protocol Suite"). What will it cost to evaluate what benevolent of services user groups need to access from the Internet? Will you need to allow complete users to exhaust email—both within the internal network and through the firewall on the Internet? The selfsame goes for what sites users will exist allowed to access using a network browser and other network applications. Will you Have users who labor from home and require dial-in or VPN access through the Internet?
  • Can your users tolerate a runt downtime now and then due to network problems, or is it necessary to provide a high-availability network? Will you need clustered servers to provide for a high degree of uptime, or Do your users' applications not suffer from a temporary loss of the exhaust of a server? To provide for maximum uptime, can you afford to build redundancy into your network? For example, Chapter 2 discusses redundant topologies that can exist used to forestall a sole point of failure from making the network (and its resources) unavailable. Chapter 11, "Network Attached Storage and Storage area Networks," describes methods you can exhaust to mirror data at geographically faraway locations.
  • In an existing network, will you withhold the current protocol or upgrade to a different protocol standard? If you create a network from scratch, what factors should affect your network protocol decision? Ethernet is the most accepted LAN technology in the world today. TCP/IP is the most accepted protocol suite that runs on Ethernet. Yet there are cases in which other technologies Have their niches. consider the implications (such as advocate costs and security) to maintain older, proprietary protocols.
  • Who Are Your Clients?

    This seems enjoy a very simple question. However, I'm not saying, "What are your clients' names and how well Do you know their children?" I am referring instead to your lore of the job descriptions for the users on the network. You need to assess labor patterns for various departments so that you can appropriately location servers, high-bandwidth links, and other such things in the commandeer physical location of the network. If most of the network traffic you hope to observe will Come from the engineering department, you'll need to provide that department with a large data pipe. In Chapter 4, "Upgrading Strategies and Project Management," you'll find more information about surveying the user community to Come up with a purpose that places resources where they are needed.

    What Kinds of Services or Applications Will the Network Offer?

    Of course, everyone knows that the most valuable office of a network today is to advocate multiuser gaming. Seriously, though, you need to acquire a list of the kinds of applications currently in use, as well as a list of those requested by users. Each application should Have a written risk assessment document that points out potential security problems, if any. Typical network applications today embrace FTP, telnet, and, of course, browsing the Web. There are "secure" versions of these applications and there are versions that leave a door wide open into your network. Whatever list of applications you chose to advocate over the network, withhold in mind two things:

  • Is the application safe? Most applications today Come in secure versions or can exist used with a proxy server to succor minimize the possibility of abuse. Yet, as they complete Have seen, even the largest corporations are targets at times, and those companies Have the staff that should exist able to forestall these things from happening. Because proxy servers are an valuable component of firewalls, this topic is covered in greater detail in Chapter 45. If you want a secure network, this is highly recommended reading!
  • Does one application overlap another? Every user has his or her favorite application. Some people enjoy one word processor, whereas others prefer a different one. But when dealing with applications or application suites (such as Microsoft Office), you'll find it better to acquire a conclusion and stick with a sole product if it can meet the needs of your users. They might not enjoy it, and training might exist necessary, but supporting multiple applications that Do the selfsame thing wastes money and leads to confusion.
  • A commonly overlooked system for getting data files out of a network and onto the Internet is to simply transmit the files as an attachment to an email. So if you contemplate you've blocked file transfers by disabling FTP access through the firewall, this case should flaunt that you really Do need to Do a thorough evaluation of any current application or service you will allow on the network. current applications should exist justified with facts that flaunt why they are needed. If an existing application can exist used to accomplish the selfsame goal, why Do you need another application? Should you retire the older application and exhaust a newer one? Pay attention to the details. And don't forget to test current applications to ensure that they achieve as expected. The selfsame goes for older applications—will they labor on the current or upgraded network?

    Lastly, Do you monitor network usage? Do you want to permit users to spend their days browsing the Net, or checking personal email while at work? Many companies Have policies that apply to using the telephone for personal business. Do you overlook this situation when giving users email capability? Are you preventing access to sites that are obviously not business-related?

    What Degree of Reliability Do I Require for Each Network Link?

    Just how much downtime is acceptable? For most users, the reply would exist zero. valuable components of your network, such as file servers, should Have foible tolerance built in from the bottom up. In large servers, you'll find dual-redundant power supplies (each connected to a divide UPS), and disk arrays set up using RAID techniques to provide for data integrity in the event that a disk goes south. If a link between two offices needs to exist up 100% of the time, you should purpose for multiple links between the two sites to provide a backup capability. In this case, you furthermore can warrant the cost of the extra link by using load balancing so that network response time is improved. And, if you are using multiple links to remote sites, it's always a genuine view to Have more than a sole path to the site. At one site this author worked at, there were redundant power lines bringing electricity into the site—side-by-side. If a tree falls, will it bring down one or both of those power lines?

    Another technology that can exist used to provide an extra layer of redundancy, as well as high-speed access to storage devices, is the Storage area Network (SAN). A SAN is a network that is divide from the LAN and contains only storage devices and servers that need to access those devices. Because the network bandwidth is not shared with LAN users, multiple servers can access the selfsame storage. If one server fails, other servers can exist configured to provide redundant access to the data. Also, the selfsame RAID and other redundancy techniques used for storage devices that are directly attached to a server (such as the SCSI hardware and protocols) can exist used on a SAN.

    arrow.jpg

    The terms RAID and UPS are valuable in today's networks, as is the concept of load balancing and dual-redundant power supplies in large networks. You can find out more about RAID (Redundant Array Of Independent Disks) and UPSs (uninterruptible power supplies) by reading Chapter 5, "Protecting the Network: Preventative Maintenance Techniques." For more information about SANs, observe Chapter 11.

    The extinct maxim "If it ain't broke, don't fix it" doesn't apply to networks. You should always exist proactively looking for potential sole points of failure and doing something to fix them. By structure redundancy into the network design at the start, you'll reclaim yourself a lot of grief in the future.

    Chapter 5 can give you more suggestions about using clustering, backups, uninterruptible power supplies, and other techniques that can withhold the network up and running.

    Choosing a LAN Protocol

    Today the de facto protocol of election has to exist TCP/IP. However, other protocols Have their location in some vertical markets. In this book, they talk about NetWare. NetWare has been around so long that you might find you Have no election when designing an upgrade but to withhold using IPX/SPX, depending on the applications your network uses. However, even NetWare has moved toward using TCP/IP as the underlying protocol. This is basically the case for version 5.x and 6.x of NetWare. Older NetWare networks should upgrade, if possible, to one of these newer versions. If you will exist connecting the network to the Internet, TCP/IP will exist a necessity. Even if you don't hope to Have an Internet connection, you'll find that choosing TCP/IP is a more practical election today because most applications labor with it and there is a large market of trained professionals who can exist hired to manage a network built on TCP/IP. NetWare 6.x provides backward compatibility with IPX/SPX for the most part, but newer features such as the iPrint—which uses the Internet Printing Protocol—require TCP/IP.

    In addition to transport protocols such as TCP/IP and IPX/SPX, you must consider application protocols that can exist used on the network. For example, to simplify administering configuration information for a large number of computers, you might want to exhaust the Dynamic Host Configuration Protocol (DHCP), which is discussed in Chapter 28, "BOOTP and Dynamic Host Configuration Protocol (DHCP)." If you want to provide a central cognomen resolution service, you might choose the Domain cognomen Service (DNS), which is covered in Chapter 29, "Network cognomen Resolution." If you are going to operate a Windows network that has pre–Windows 2000/XP clients, you might need to exhaust the Windows Internet Naming Service (WINS) for backward compatibility.

    So when thinking about a network protocol, remember that it's not just one protocol you need to worry about. After you've decided which protocols are necessary, research the security implications of each.

    It's Virtually Universal: TCP/IP

    For complete practical purposes, the measure LAN protocol today is TCP/IP. This is partly due to the rapid growth of the Internet, and the necessity of most businesses of having a Web presence, as well as the large number of vendors that Have adopted this protocol suite. If your LAN is still using an older proprietary network protocol, you should seriously consider what it would rob to upgrade to TCP/IP. Currently, TCP/IP version 4 is the most widely used protocol. In the future you can hope that the next version (IPv6) will start to find its passage from the core of the Internet out to the edge, where your network resides. While technologies such as Network Address Translation (NAT) are widely employed to remedy the problem associated with the limited address space provided by IPv4, IPv6 will enable a much larger address space. Combine that with Network Address Translation, and the long-term bets are going to exist on IPv6, or possibly some of the features that are portion of IPv6. In addition to giving you a larger address space, IPv6 includes other valuable features. Those that will affect your network the most are security mechanisms, which will only become more valuable as Internet commerce continues to grow.

    arrow.jpg

    For a minute introduction to TCP/IP, observe Chapter 24, "Overview of the TCP/IP Protocol Suite"; Chapter 25, "Basic TCP/IP Services and Applications"; and Chapter 27, "Troubleshooting Tools for TCP/IP Networks."

    There is one very valuable judgement you should consider TCP/IP as a LAN protocol: There are more trained professionals knowledgeable in TCP/IP than any other LAN protocol at this time. It is appealing to note that in Windows NT 3.51, the default network protocol was Microsoft's implementation of IPX/SPX (NWLink). In Windows NT 4.0 (and successive operating systems, from Windows 2000, XP, and Server 2003), the default network protocol is TCP/IP.

    If your network is composed of several operating systems, from Windows to NetWare to Unix and Linux, then the bottom line is that TCP/IP is the lowest common denominator that will allow the easiest connectivity and interaction between complete of these. Even Microsoft's now-legacy NetBIOS/NetBEUI protocols Have been adapted to hasten over TCP/IP.

    Novell's NetWare Version 6.5

    NetWare was perhaps the first attempt at seriously providing a LAN protocol that was effortless to use. The basic file and print services offered by early versions of NetWare were much better than other solutions available at that time. After it became established in the traffic community, NetWare became the network solution of election in many traffic environments that used the PC. Microsoft countered this success with its LANManager products, which were furthermore marketed by other vendors in their own way, such as the Pathworks solution from Digital outfit Corporation.

    Today NetWare is a totally revamped solution to LAN connectivity. It provides many current features that are addressed to specifically acquire exhaust of the Internet, and allow mobile users to connect to their home networks, as well as to enable NetWare users to acquire connections to outside networks. For example, the iPrint feature enables NetWare users to print to a printer on a remote network. For example, instead of sending a catalog that may exist out of date in a month or so, you can exhaust iPrint to periodically transmit specific information apposite to each customer, by printing it directly to the customer's printer.

    And NetWare's iFolder allows mobile users to synchronize data stored on remote computers (such as a laptop computer) with the data stored on the company's network. Microsoft and other vendors present similar features. However, the point to remember is that if you already are a NetWare user, you don't Have to throw out your existing investment and whisk to a Microsoft network, or even a Unix/Linux environment. NetWare has changed as the market has changed, and you might find it less expensive to upgrade to NetWare 6.5 than to migrate to another platform. The bottom line involves not just the cost of migrating to another operating system, but the costs involved with retraining your network administrative personnel in current technology.

    Because NetWare 6.5 is so tightly integrated with the IP protocol, and furthermore offers backward compatibility with IPX/SPX, admins for existing NetWare networks should consider upgrading to NetWare 6.5 as well as considering other options.

    If you want to whisk to Linux, Novell makes it effortless by incorporating an enhanced version of NetWare 6.5 and SuSE Linux into its Novell Open Enterprise Server. Open Enterprise Server supports both Linux and NetWare-specific software and features, enabling you to whisk to Linux gradually.

    Other LAN/WAN Protocols

    The distinction between LAN and WAN (wide area networking) protocols is dawn to blur. Ethernet was once considered to exist a LAN protocol. As time has passed, other technologies, such as Token-Ring, Have become minor players in the LAN world. Yet the contrary is equable of Ethernet. It has grown from a modest specification endorsed by Intel, DEC, and other vendors, such that it now can exist considered a WAN protocol. The capabilities introduced by current LAN technologies are dawn to erode the differences between a LAN and a MAN (metropolitan area network). When the fourth edition of this engage was published, Gigabit Ethernet was starting to plunge into the inexpensive ambit of network topologies. That trend has continued and now 10Gigabit Ethernet (10GbE) is frequently being used in enterprise data centers. Today you may exist using 100BASE-T for connecting client computers to the network, and Gigabit Ethernet to connect network segments via the network backbone. In some cases your network might even exist exclusively based on 10GbE.

    What does this imply to a network administrator today? With 10Gigabit Ethernet, you can exhaust TCP/IP not only to create a local area network backbone, but to extend that compass to a metropolitan area network. And because TCP/IP is so intertwined with Ethernet, you can achieve an end-to-end MAN link that uses TCP/IP over faster Ethernet connections. Instead of employing more expensive solutions, such as SONET, you can now connect arm offices in the selfsame geographical area using just TCP/IP.

    You may not Have to worry about installing expensive outfit used by SONET and other typical MAN protocols. Still, for the long haul—for example, between different cities—other protocols such as ATM and Frame Relay will Come into play.

    arrow.jpg

    For more information about SONET, ATM, and Frame Relay, observe Chapter 15, "Dedicated Connections."



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