Your company has a main office and three branch offices.
You have an Exchange Server 2013 organization. The main office contains five Exchange servers. Each branch office contains two Exchange servers. All of the servers have all of the Exchange server roles installed. Each branch office contains one database availability group (DAG).
You need to recommend a load balancing solution for the branch offices. The solution must meet the following requirements:
Ensure that both servers in each office are the targets of all client connections.

Minimize cost.

What should you include in the recommendation?
Correct Answer: A,D
Explanation/Reference:
Explanation:
DNS round robin will distribute connections between the servers. The IP addresses of the servers are returned to the client in a different order every time which distributes the connections between the server.
Network Load Balancing shares connections between the servers. Clients connect to a single Virtual IP then NLB will redirect the connection to the servers in the NLB cluster.
Incorrect Answers:
B: A hardware load balancer would work but it is not the cheapest option.
C: A CAS array does NOT load balance the connection between the servers. With a CAS array, you still need a load balancing mechanism to distribute the connections between the servers in the array.