Exchange 2013 Deployment

Hi,

One of our customer wants to build a new infrastructure

1. New Domain Controller

2. New Exchange 2013

Is it possible to have the below setup

1. Primary and Secondary AD/DNS

2. Two Mailbox servers in DAG and two CAS servers in NLB mode

Is the above settings fine ? as the customer has a small environment of only 200 users and also we will deploying all the above on a virtual setup using VMware.

Kindly suggest....