What is bridgehead server?
A bridgehead server is a domain controller in each site, which is used as a contact point to receive and replicate data between sites. For intersite replication, KCC designates one of the domain controllers as a bridgehead server. In case the server is down, KCC designates another one from the domain controller. When a bridgehead server receives replication updates from another site, it replicates the data to the other domain controllers within its site.
What is universal group membership caching?
Universal group membership caching is a feature of Windows 2003, which reduces the need of placing Global Catalog servers at all the remote locations for user authentication. The universal group membership caching feature can be enabled on any domain controller in a site. The domain controller, with universal group membership caching enabled, contacts a Global Catalog server whenever a user attempts to log on for the first time. The server then caches the user information locally and uses this information to authenticate the user the next time he attempts to log on.
Note: Universal group membership caching can handle only the logon authentication part of a Global Catalog server. It is not capable of handling directory-wide queries.
What is GPO?
Group policy object (GPO) is a collection of group policy settings. It can be created using a Windows utility known as the Group Policy snap-in. GPO affects the user and computer accounts located in sites, domains, and organizational units (OUs). The Windows 2000/2003 operating system supports two types of GPOs, local and non-local (Active Directory-based) GPOs.
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