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Tutorial Overview
Testing the new DNS configuration settings in a Windows 7 client computer
Configuring DNS client computers typically entail the execution of the following administrative tasks: 1- Setting the client computer names for each computer. 2- Configure a primary DNS suffix for the computer. 3- Identify the DNS servers for the DNS clients to query for name resolution. You can configure preferred DNS servers, and alternate DNS servers. The alternate DNS servers would be used when the preferred DNS servers are unavailable. 4- Configure a connection specific DNS suffix for every individual adapter on the DNS client.

Troubleshooting the Nslookup "unknown" response for the default DNS server name
Nslookup might also return one of several errors. The following message means that the resolver did not locate a PTR resource record (containing the host name) for the server IP address. Nslookup can still query the DNS server, and the DNS server can still answer queries. 1-error Can't find server name for address < IP Address >: Timed out. 2-error Default servers are not available. 3--error Default Server: Unknown 4-error The following message generally means that the DNS server is running, but is not working properly. < Server > can't find < Name or IP address queried for >: Server failed.

Creating the first DNS forwarder
The order of the IP addresses listed as forwarders on a DNS server determines the sequence in which the IP addresses are used. After the DNS server forwards the query to the forwarder with the first IP address, it waits a short period for an answer from that forwarder (according to the DNS server's time out setting) before resuming the forwarding operation with the next IP address. It continues this process until it receives an affirmative answer from a forwarder. Important: A DNS server cannot forward queries for the domain names in the zones it hosts. When you have configured the other DNS servers in your network to forward queries they cannot resolve locally to that DNS server it will act as your forwarder.