Answer / keerthi

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.

Answer / sanjay chauhan accenture

By default, the Active Directory replication topology
generator, the Knowledge Consistency Checker (KCC),
automatically chooses servers to act as bridgehead servers.
However, if you are an administrator, you may select one or
more domain controllers in the site to be preferred
bridgehead servers. These servers are used exclusively to
replicate changes collected from the site. Even though you
may have administratively configured several domain
controllers as preferred bridgehead servers, the KCC
chooses one of these servers to become the bridgehead
server for the site. However, if you choose only one
bridgehead server for a particular site, and that server
becomes unavailable, the KCC does not choose another domain
controller to be the bridgehead server. Therefore, if you
assign a preferred bridgehead server, you should assign
more than one.

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