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network, you would do this primarily so that the clients can gain access to resources to update their health from a remediation server or health update resources That means those servers/resources (for example, a Windows Server Update Services [WSUS] server or antivirus de nition server) must be accessible from the restricted network A couple of questions might occur to you at this point What about my older computers What about my non-Microsoft clients As stated earlier, the NAP client is supported, at least initially, on Windows Vista, Windows XP SP3, and of course, Windows Server 2008 Older operating systems do not support NAP nor do non-Microsoft OSs such as Linux and those pesky Macintosh computers at least support will not come from Microsoft A NAP client is available for Linux already from http://unetsystemcokr/nap/ and you can expect more NAP clients to come as NAP grows in popularity There is currently no support for Windows CE/Mobile/PDAs and printers as NAP clients Microsoft is forming partnerships, and NAP clients are being developed for other platforms A partnership has also been created with Cisco, which has its own NAP solution, known as Network Access Control (NAC), to enable NAP to fully interoperate with NAC installations Look at wwwmicrosoftcom/windowsserver2008/nap-partnersmspx, which lists all the partners Microsoft has for NAP It s pretty big and gives an indication of how many different systems can participate in the health validation of clients and the enforcement of access However, it is possible to con gure exceptions for certain types of clients so that they can get access if their platform does not support NAP If a client does support NAP and is noncompliant, you want to make it compliant If you are using that monitoring-only NAP mode, the client is given full access However, you can still send the client updates to get it compliant, whereas if you are in the restricted-access NAP mode, the client won t get full access until after you have updated it However, it is important that you don t consider NAP the method to update clients You need solutions such as System Center Con guration Manager (SCCM) or Group Policy and WSUS in place to automatically update clients as you get patches, malware de nitions, virus de nition updates, and so forth In Figure 8-28, you see all the components that are involved in the NAP process On the client, you have a number of SHAs of which Microsoft provides a base agent to report on core items used by the Windows Server 2008 System Health Validator The included Windows SHA can report on the following:
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Whether rewall software is installed and enabled Whether antivirus software is installed, enabled, and its de nition les are current Whether antispyware software is installed, enabled, and whether de nition les are current Whether Automatic Updates is enabled
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Other SHAs may be present including ones by third parties and other Microsoft solutions, such as the SCCM agent You then have the core NAP agent and a number of enforcement agents The client has a number of Microsoft-provided enforcement clients such as DHCP, IPsec, 8021x, and VPN, and others can be provided by third parties, such as other VPN solutions
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FIGURE 8-28 The overall NAP architecture Health update resources in their quarantine network are available to your clients if compliance was not met On the server side is the NAP server component running on your NPS policy server, along with SHV components that communicate with system health servers The NPS holds the system health policies de ned by the administrators and performs the validation of health against the con gured policies Between the client and the NPS policy server are various network access technologies that need to communicate with the NAP server to
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