Your network has a main office and a branch office.The branch office has five client computers that run
Windows 7.
All servers are located in the main office. All servers have BranchCache enabled.
Users at the branch office report that it takes several minutes to open large files located in the main office.
You need to minimize the amount of time it takes for branch office users to open files located in the main
office.
The solution must also reduce the amount of bandwidth used between the two offices.
What should you do?

A.
At the main office, configure the Quality of Service (QoS) Packet Scheduler on all servers.

B.
At the main office, configure the servers to use Background Intelligent Transfer Service (BITS).

C.
At the branch office, configure the client computers to use BranchCache Hosted Cache mode.

D.
At the branch office, configure the client computers to use BranchCache Distributed Cache mode.

Explanation:
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Distributed Cache Mode
Distributed Cache mode uses peer caching to host the branch office cache among clients running Windows7
on the branch office network. This means that each Distributed Cache mode client hosts part of the cache, but
no single client hosts all the cache. When a clientrunning Windows 7 retrieves content over the WAN, it places
that content into its own cache. If another BranchCache client running Windows 7 attempts to access the same
content, it is able to access that content directlyfrom the first client rather than having to retrieve it over the
WAN link. When it accesses the file from its peer, it also copies that file into its own cache.
The advantage of distributed cache mode is that youcan deploy it without having to deploy a server running
Windows Server 2008 R2 locally in each branch office. The drawback of Distributed Cache mode is that the
contents of the cache available on the branch office LAN depend on which clients are currently online.If a client
needs a file that is held in the cache of a computer that is shut down, the client needs to retrieve the file from
the host server across the WAN.
Hosted Cache Mode
Hosted Cache mode uses a centralized local cache that hosted on a branch office server running Windows
Server 2008 R2. You can enable the hosted cache server functionality on a server running Windows Server
2008 R2 that you use for other functions without a significant impact on performance. This is because if you
found that files hosted at another location across the WAN were being accessed so frequently that there was a
performance impact, you would use a solution like Distributed File System (DFS) to replicate them to the
branch office instead of using BranchCache. The advantage of Hosted Cache mode over Distributed Cache
mode is that the cache is centralized and always available. Parts of the distributed cache become unavailable
when the clients hosting them shut down.
Background Intelligent Transfer Service (BITS)
The Background Intelligent Transfer Service (BITS) has two role services: the Compact Server and the IIS
Server Extension. The Compact Server is a stand-alone HTTP or HTTPS file server, whereas the IIS Server
Extension is an Internet Information Services (IIS)plug-in that requires a server running IIS.
IIS Server Extension
The BITS IIS Server Extension lets you configure a server that is running IIS to allow BITS clients toperform
background, resumable file uploads to IIS virtual directories. On completion of a file upload, the BITS Server
can notify a Web application of the newly uploaded file. This allows the application to process the uploaded file.
The Web application can then optionally reply to the client responsible for the upload.
Compact Server
The BITS Compact Server is a stand-alone HTTP or HTTPS file server, which allows applications to host files
for BITS clients to download, and allows the asynchronous transfer of a limited number of large files between
computers.
QoS Packet Scheduler
The Quality of Service Packet Scheduler is a Windows platform component that is enabled by default on
Windows Vista and Windows XP computers. It is, however, not enabled by default on Windows 2003
computers. This scheduler is designed to control the IP traffic for various network services, including Real Time
Communications traffic. This component must be installed and enabled if the QoS markings described earlier
for audio and video traffic are to be implemented by the IP stack.