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Description May require support for features that are not mandatory and may not support vendor extensions Requests an IP address each time the client starts. Does not recognize IP leases Addresses for these clients manually configured

To specify how long the forwarding server should wait for a response from a forwarder before timing out, on the Forwarders tab, enter a value in the Number Of Seconds Before Forward Queries Time Out text box. The default setting is 5.

When to Use Forwarders In some cases, network administrators might not want DNS servers to communicate directly with external servers. For example, if your organiza tion is connected to the Internet by means of a slow wide area link, you can optimize name resolution performance by channeling all DNS queries through one forwarder, as shown in Figure 5-4. Through this method, the server cache of the DNS forwarder has the maximum potential to grow and reduce the need for external queries.

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Forwarding DNS server (forwards to 192.168.0.1)

Multiple users can access mandatory and super-mandatory profiles simultaneously, because the workstations do not upload any changes to the profiles on the server. Standard roaming profiles are not suitable for multiple users because updates might conflict.

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Forwarding DNS server (forwards to 192.168.0.1)

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Another common use of forwarding is to allow DNS clients and servers inside a firewall to resolve external names securely. When an internal DNS server or client communi cates with external DNS servers by making iterative queries, normally the ports used for DNS communication with all external servers must be left open to the outside world through the firewall. However, by configuring a DNS server inside a firewall to forward external queries to a single DNS forwarder outside your firewall, and by then opening ports only to this one forwarder, you can resolve names without exposing your network to outside servers. Figure 5-5 illustrates this arrangement.

In this practice, you will design a DHCP infrastructure for the proposed Northwind Traders office in Rio de Janeiro, Brazil. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter.

DNS server (forwarding) 192.168.0.1

DNS server (forwarder) 207.46.200.1

Northwind Traders plans to open an office in Rio de Janeiro. The new office will occupy three different floors of a large office building in the heart of the city. The exist ing network has several subnets, as shown in the following diagram. All routers can be configured to forward DHCP requests to a DHCP server.

Figure 5-5

Disabling Recursion The Forwarders tab allows you to disable recursion on any que ries, specified by domain, that have been configured to be forwarded to an upstream server. When recursion is not disabled (the default), the local DNS server attempts to resolve a fully qualified domain name (FQDN) after a forwarder has failed to do so. This condition is preferable if you want to optimize settings for fault tolerance: if the upstream forwarder is down, name resolution can fall back to the local DNS server. However, when under this default setting the forwarder receives the forwarded query and still fails to resolve it, the subsequent fallback recursion that occurs at the local DNS server is usually redundant and delays an inevitable query failure message response. Disabling recursion on queries for which forwarding has been configured thus optimizes the speed of negative query responses at the expense of fault tolerance. When forwarders are configured this way in combination with disabling recursion, the local DNS server is known as a slave server because in these cases, it is completely dependent on the forwarder for queries that it cannot resolve locally.

Based on the scenario, determine how you can plan a DHCP solution for automated host IP configuration in the new office by answering the following questions. 1. Given the scenario, and ignoring reliability considerations, how many DHCP serv ers are required for a DHCP solution Why

Do not confuse the use of the term slave server with the term slave zone, which is used in some implementations of DNS. In some non-Microsoft DNS servers, such as Berkeley Internet Name Domain (BIND), primary zones are called master zones and secondary zones are called slave zones.

To create roaming profiles and configure workstations to use them with Group Policy, use the following procedure:

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2. Given the scenario, and ignoring reliability considerations, how many DHCP relay agents are required for a DHCP solution Why

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