A. To minimize bandwidth usage during intersite communication, the Knowledge Consistency Checker (KCC) dynamically chooses a server from each site to handle the communication. These servers are the bridgehead servers. Rather than letting the KCC choose the servers, you might prefer to nominate domain controllers (e.g., a domain controller with the best network connectivity, a domain controller that is the proxy server in a firewall environment).
A server that you nominate is a preferred bridgehead server. You can select multiple preferred bridgehead servers for a site, but only one of the servers is active at a time. If the active preferred bridgehead server fails, then another preferred bridgehead server becomes the active server. If no preferred bridgehead servers are available, a regular Windows 2000 domain controller becomes active for intersite communication. Letting a regular Win2K domain controller handle intersite communication might cause problems if the server lacks sufficient resources.
- To nominate a server as a bridgehead server, start the Active Directory Sites and Services MMC snap-in. (Select Programs, Administrative Tools, Active Directory Sites and Services from the Start menu.)
- Expand the Sites branch.
- Expand the site containing the server, and select the Servers container.
- Right-click the server, and select Properties.
- Select the protocol you want the server to act as a preferred bridgehead server for (i.e., SMTP or IP), as the Screen shows, and click Add.
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- Click OK.
When the KCC runs the next time, the connection objects will change to use the bridgehead server you specified.