Your company has one main office and four branch offices. An Active Directory site exists for each
office. The network consists of one Active Directory domain. All servers run Windows Server 2008.
The branch offices are connected to the main office by slow and unreliable wide area network
(WAN) links. Users complain that WAN link failures prevent them from accessing files on remote
servers. You need to recommend a solution to maintain availability of files on the remote servers.
The solution must meet the following requirements:
Support scheduling of WAN link traffic.
Enable the connection to resume immediately after a WAN link interruption.
What should you recommend?

A.
Use DFS Replication and replicate data to each branch office.

B.
Use the File Server Resource Manager (FSRM) and create file screens.

C.
Use the File Replication Service (FRS) and replicate data to each branch office.

D.
Configure separate DFS Namespaces on each branch office server.

Explanation:
To keep folders synchronized between servers across all the branch offices of the company even if
the WAN link fails and to take care that WAN link traffic can be scheduled and resume the
connection immediately as soon as the WAN link interruption occurs, you need to use DFS
Replication. DFS Replication is an efficient, multiple-master replication engine that you can use to
keep folders synchronized between servers across limited bandwidth network connections. The DFS
Replication in Windows Server 2008 also allows quicker recovery from unexpected shutdowns.
Reference
http://technet2.microsoft.com/windowsserver2008/en/library/1f0d326d-35af-4193-bda3-
0d1688f90ea71033.mspx?mfr=true