Configure the DAG Within the Exchange 2013 Enviroment with Single Network Interface.

Hi Guys,

I am planning to configure the DAG within my environment. At the moment i have two exchnage 2013 server and one witness server (Non Exchange server.)

Server A: EX2013-01 IP: 10.20.10.20
Server B : EX2013-02 IP: 10.20.10.30
Witness: Server 2012 R2 IP: 10.20.10.40

and all are Configured with the Same Office Network for example: 10.20.10.0 /24.

so when i creating the DAG, it is asking to give IP to DAG.

so I have few question before i start to Move on with this Process.

1. What is the Use of the IP which we assign it to the DAG?
2. Do i have to have the dedicated replication Network for DAG?
3. can I not just create the DAG and Assign the IP from the same Network which is also the client connectivity network
   and Create the DAG and go on with the process.
4. Any More Advice please ?
   
   Thank you so much.