Your network contains an internal network and a perimeter network. The internal network contains four offices.
The perimeter network is located in a separate office. Each internal office has a direct WAN link to all other
internal offices.
Each of the four offices that make up the internal network is configured as an Active Directory site. The Active
Directory sites and site links are configured as shown in the exhibit. (Click the Exhibit button.)

Your company has an Exchange Server 2013 organization. Each site contains two servers that have theMailbox server role and the Client Access server role installed.
To the perimeter network, you deploy two servers that have Exchange Server 2010 Service Pack 2 (SP2) and
the Edge Transport server role installed. You configure an Edge Subscription to Site1.
You deploy a new email notification application to Site4. The application will send 25,000 email messages daily
to external recipients.
You need to identify which WAN links will have increased traffic from the new email application.
Which WAN link or links should you identify? (Each answer presents part of the solution. Choose all that apply.)

A.
The WAN link between Site4 and the perimeter network

B.
The WAN link between Site4 and Site3

C.
The WAN link between Site1 and the perimeter network

D.
The WAN link between Site4 and Site1

E.
The WAN link between Site4 and Site2

Explanation:
C: the traffic will increase on the single WAN link on the perimeter network.
E: The traffic will increase between Site4 and Site2 since the cost of this link (5) plus the cost of the link
between Site2 and Site1 (1) is lower the cost on the direct link between Site4 and Site1 (10).
Incorrect answers:
Not A: There is no WAN link between Site4 and the perimeter network.
Not B: The cost of the WAN link between site3 and site3 is high (10). This path will not be chosen.
Not D: There is no WAN link between Site4 and Site1.