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Case Scenario Exercise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-82

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Clients can have network connectivity problems for a variety of reasons Sometimes these problems occur because of no particular configuration fault, for example, when a scope runs out of leases Sometimes they occur because of misconfiguration in the client itself, such as an incorrect static DNS server address configuration And sometimes they occur because of misconfiguration of a server other than the DHCP server, for example, an incorrectly configured DHCP relay agent on the router Sometimes, however, the fault is in the DHCP server itself Options might be config ured at the wrong level A scope for a second subnet could be added, but option 003 is set at the server level and specifies the local default gateway As a result, clients on the second subnet get a default gateway that isn t on their subnet and will not be able to ping clients on the first subnet.

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When a DHCP server is installed and configured in an Active Directory domain, it needs to be authorized in Active Directory This process usually happens automatically for the first server Consequently, you are likely to forget to perform this task for the second server Alternatively, the second server might not be authorized because of overlapping scopes, for example An unauthorized (or rogue) server will not issue leases Options are sometimes set at incorrect levels Where different options apply to differ ent scopes, they should be set at the scope level Where they apply to all the scopes in the server, they should be set at the server level Sometimes, options are set at the cli ent reservation level, and it is easy to forget to update them if, for example, the IP address of a primary DNS server changes DHCP databases sometimes need to be reconciled.

Each of these options represents a better top-level OU structure than, for example, bas ing OUs on divisions of the company, which are more likely to change. When planning the top-level OU structure in a multidomain environment, consider cre ating a top-level design that is consistent across every domain on the network. Using an object-based or task-based design (described in the next sections) is particularly effective in this situation. Creating a top-level OU structure that is consistent across domains keeps administration and support consistent throughout the network. Lower-level OUs (those created inside the top-level OUs) should represent more detailed levels of administrative authority within your organization or should be used for other purposes such as Group Policy application. Remember that by default, lowerlevel OUs inherit the permissions of their parent OUs. When you are constructing your plan, you also need to plan where you want inheritance to happen and where you don t. When designing lower-level OUs, it s easy to get carried away. Remember that your main goal is to design a structure that simplifies the administration of accounts and resources as much as possible. To this end, keep your design as simple as possible. If you create a nested OU structure that is too deep, you not only create a more confus ing structure, but also may reduce performance. An OU may have multiple levels of Group Policy being applied to it from the domain, site, and any parent OUs. The more policies that need to be applied, the longer the response time and the slower the perceived performance.

The integrity of the database can become compromised, possibly by a hardware or system glitch Fortunately, reconcil ing a database at either the server or scope level is a straightforward operation, and you can initiate it either from the DHCP console or by using the Netsh utility Sometimes errors in DHCP configuration result in DNS errors rather than DHCP errors DHCP controls how DNS resource records are dynamically registered and deleted when leases expire A DHCP server that has been removed from the DNSUpdateProxy group can cause problems when DNS clients are set up to register their own host A.

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Initially, you should create an OU structure that effectively enables delegation of administration, whether you create an object-based or a task-based design. Once you have completed this initial OU design, you should then create additional OU structures to control the application of Group Policy to users and computers and to limit the visibility of objects.

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