Avamar replication port usage

I am onsite implementing Avamar 7.4 with Data Domain.

We have two Avamars, one at siteA and one at siteB.

replication has been setup and established however networking hows that ports used are:

27000

28001

30001

30003

9443

security people want to know about encryption, authentication and protocols used with these ports for replication.

Does anyone have further info on this? thanks!