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
the Mailbox 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.
Wrong answer! Do not mess site link which is logical and WAN link which is physical. “Each internal office has a direct WAN link to all other internal offices” means that WAN link between Site 3 and Site 4 exist and there are two LOCICAL paths defined by site links. Agregate cost defined with site links Site 2 -Site 4 and Site 2 – Site 3 (5+1=6) is lower that site link Site 3 – Site 4 (10) and mail should flow on WAN link between Site 4 and Site 3. B and C are correct answers.
Sorry but I don’t understand Emos answer.
From a logical link perspective, the increased traffic would be between 4->2, 2->3,3->1, and 1->perimeter network because this would be the least cost path.
It is recommend to design the logical paths based on the physical links.
We know that each Office connects to each other office by a physical WAN link. Since the logical flow would start with site 4 and end with site 1, the physical path should be 4->1. Hence, it would say C and D is the answer.
If anyone has a different explanation, please share it in detail.
The given answer is correct. Even though there’s a physical link between site1 and site4 there’s no site link. The least cost logical path from site4-perimeter is just as Chris said 4-2-3-1-P. The only choices listed that line up with that logical path are C and E