DAG Security and Connectivity

Hello,

I'm researching to know how the DAG security and connectivity work and what it need.

i would know what is the encryption types used in DAG 2013 and is thecertificates required ,or it is not used at all ?

And what is the connection types between 2 mail boxes in a DAG is it RPC-HTTPS ? or different port (64327) for replication ? if the repl port used what we use the other ports for ?

Sorry for asking many questions ,and i hope i can find the right answers.

Thanks