Your company has two branch offices that connect by using a WAN link. Each office contains a server that runs Windows Server 2008 R2 and that functions as a file server.

Users in each office store data on the local file server. Users have access to data from the other office.

You need to plan a data access solution that meets the following requirements:

– Folders that are stored on the file servers must be available to users in both offices.
– Network bandwidth usage between offices must be minimized.
– Users must be able to access all files in the event that a WAN link fails.

What should you include in your plan?

A.
On both servers, implement DFS Replication.

B.
On both servers, install and configure File Server Resource Manager (FSRM) and File Replication Service (FRS).

C.
On one server, install and configure File Server Resource Manager (FSRM). On the other server, install and configure File Replication Service (FRS).

D.
On one server, install and configure Distributed File System (DFS). On the other server, install and configure the Background Intelligent Transfer Service (BITS).

Explanation:
MCITP Self-Paced Training Kit Exam 70-646 Windows Server Administration:

DFS Replication provides a multimaster replication engine that lets you synchronize folders on multiple servers across local or WAN connections. It uses the Remote Differential Compression (RDC) protocol to update only those files that have changed since the last replication. You can use DFS Replication in conjunction with DFS Namespaces or by itself.

File Replication Service (FRS) The File Replication Service (FRS) enables you to synchronize folders with file servers that use FRS. Where possible you should use the DFS Replication (DFSR) service. You should install FRS only if your Windows Server 2008 server needs to synchronize folders with servers that use FRS with the Windows Server 2003 or Windows 2000 Server implementations of DFS.

The main tool for implementing shared folder replication in a Windows Server 2008 network is DFS Replication.

Using DFS Namespace to Plan and Implement a Shared Folder Structure and Enhance Data Availability

When you add the DFS Management role service to the Windows Server 2008 File Services Server role, the DFS Management console is available from the Administrative Tools menu or from within Server Manager. This console provides the DFS Namespaces and DFS Replication tools as shown in Figure 6-31

DFS Namespaces lets you group shared folders that are located on different servers into one or more logically structured namespaces. Each namespace appears to users as a single shared folder with a series of subfolders.

This structure increases availability. You can use the efficient, multiple-master replication engine provided by DFSR to replicate a DFS Namespace within a site and across WAN links. A user connecting to files within the shared folder structures contained in the DFS Namespace will automatically connect to shared folders in the same AD DS site (when available) rather than across a WAN. You can have several DFS Namespace servers in a site and spread over several sites, so if one server goes down, a user can still access files within the shared folder structure.

Because DFSR is multimaster, a change to a file in the DFS Namespace on any DFS Namespace server is quickly and efficiently replicated to all other DFS Namespace servers that hold that namespace. Note that DFSR replaces the File Replication Service (FRS) as the replication engine for DFS Namespaces, as well as for replicating the AD DS SYSVOL folder in domains that use the Windows Server 2008 domain functional level. You can install FRS Replication as part of the Windows Server 2003 File Services role service, but you should use it only if you need to synchronize with servers that use FRS with the Windows Server 2003 or Windows 2000 Server implementations of DFS.