Reasons For Adding A Global Catalog And Their Consequences Replication
Additional network traffic due to replication
Add a global catalog when Advantage Disadvantage
A commonly used application in the site utilizes port 3268 to resolve global catalog queries. Performance improvement Additional network traffic due to Fault tolerance
A slow or unreliable WAN connection is used to connect to other sites. Use the same failure and load distribution ailes that you use for free practice tests individual domain controllers to determine whether additional global catalog servers are necessary in each site.
Fast user logon implementation
Additional network traffic due to replication
Users in the site belong to a Microsoft Windows 2000 or Windows Server 2003 domain ainning in native mode. In this case, all users must obtain universal group membership information from a global catalog server. If a global catalog is not located within the same site, all logon requests must be routed over your WAN connection to a global catalog located in another site. (If the domain controller is a Windows Server 2003 domain 70-297 Exam controller and it has the universal group membership caching option enabled, then all users obtain a current cached listing of their universal group memberships from the domain controller located within their site, and an additional global catalog is not needed.)
Note You might want to continue using a global catalog in branch office locations if an application in a site is sending global catalog queries to port 3268. Universal group membership caching feature does not intercept calls made to port 3268.
If your organization uses Microsoft Exchange 2000 Server, you should try to place a global catalog server in each site that contains an Exchange server. MCSE Exam This is because Exchange 2000 uses Active Directory as its directory service, and all mailbox names are resolved by queries through Active Directory to the global catalog server. In a large Exchange environment, a global catalog server might need to handle a large number of queries, so placing a global catalog server in each site that contains an Exchange server can ensure that all queries are handled promptly.
Tip Know the reasons for adding a global catalog server.