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Exam Tip
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After this lesson, you will be able to
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Install WSUS on a computer running Windows Server 2003 Configure WSUS Deploy and configure Automatic Updates for WSUS clients
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Estimated lesson time: 30 minutes
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9
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Maintaining the Operating System
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Understanding WSUS
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Since 1998, Microsoft Windows operating systems have supported Windows Update, a globally distributed source of updates. Windows Update servers interact with client-side software to identify critical updates, security rollups, and enhancements that are appropriate to the client platform and then to download approved patches. Several years later, Microsoft introduced Automatic Updates, a client-side component that enabled users to schedule update detection, download, and installation and thereby removed most of the risk presented by users who never visited the Windows Update site. But Automatic Updates and the server-side Windows Update still had two major faults. First, they provided updates to only the Windows operating system. Users had to visit the Office Updates site to receive patches for Microsoft Office applications, and those patches could not be scheduled or installed without user interaction. There was no mechanism for automatically detecting updates to any other major Microsoft platform, server, or application. The second weakness of Automatic Updates and Windows Updates was that there was not a way to control exactly which updates were applied, leading to a risk that an update would break another system component or application. Administrators wanted a more centralized solution that would assure more direct control over updates that are installed on their clients. These two key customer demands were addressed during the first half of the decade, first by SUS, which enabled enterprises to centralize and manage the approval and distribution of updates; second, by the new Microsoft Update service (http://update.microsoft.com/microsoftupdate), a revision and superset of Windows Update that provides updates to a variety of platforms, servers, and applications; and third, by WSUS, which empowers you with greater levels of control and reporting and provides a foundation for an update framework on which Microsoft and its customers can build new functionality. For example, Microsoft s new corporate antispyware platform will deliver updates to spyware definitions through WSUS. It is easiest to understand WSUS by focusing on its components:
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Updates Updates are revisions to the code of a platform, server, or application. Microsoft categorizes updates as security updates, nonsecurity-related patches simply called updates, enhancements to functionality called feature packs, fixes to highly specific issues called hotfixes, and collections of updates called cumulative updates, rollups, or service packs. The lines between these categories are sometimes blurry; however, two points are important to highlight. First, security updates warrant your immediate and focused attention with the goal of evaluating updates for deployment to appropriate systems as quickly as reasonably possible. To facilitate your analysis, Microsoft rates security updates as Crit-
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Lesson 1
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Windows Server Update Services
ical, Important, Moderate, and Low. Second, hotfixes, which are highly specific and have not been regression tested, should be applied only to systems that are encountering the issue addressed by the hotfix. Other categories of updates fall between these two extremes. Updates consist of two elements: the update file itself, which is downloaded and installed by the client, and information about the update, such as its release date, the technologies to which the update applies, and whether the update supersedes a previous update. The information about the update is called metadata.
The Windows Update and Microsoft Update services These globally distributed services provide updates to clients. Users visiting these sites download an ActiveX control that interacts with the local system to identify, download, and install required updates. Automatic Updates The Automatic Updates client is responsible for downloading updates from Windows Update, Microsoft Update, or a WSUS server and installing those updates based on a schedule or an administrator s initiation. WSUS, running on an Internet Information Services (IIS) server with connectivity to a local or remote database WSUS is responsible for synchronizing information about available updates from Microsoft Update and, typically, downloading approved updates. WSUS thereby centralizes the distribution of updates, so Automatic Updates clients can be directed to use an intranet update infrastructure rather than Microsoft s online update services. You can distribute WSUS servers throughout an enterprise to provide the most effective delivery of updates to systems in the enterprise, and you can configure each WSUS server to download from either Microsoft s update services or another internal WSUS server. The WSUS database, in which information about updates and clients is stored, can be either Microsoft SQL Server 2000 or later or SQL Server 2000 Desktop Engine (Windows) (WMSDE). The choice of a database engine will be discussed later in the lesson. The WSUS administration Web site All WSUS administration is Web-based. After installing and configuring WSUS, regular administration consists of ensuring that the WSUS server is synchronizing successfully, approving updates for distribution to network clients, and reporting the status of the update infrastructure. The Uniform Resource Locator (URL) of a WSUS server s administrative Web site is, by default, http://servername/WSUSAdmin. Group Policy settings Automatic Updates clients can be configured to synchronize from a WSUS server rather than the Windows Update servers by modifying the clients registries or, more efficiently, by configuring Windows Update policies in a Group Policy Object (GPO). The configuration of the Automatic Updates client will be addressed in the next lesson.
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