You can use repadmin tool to test it.
Using Repadmin Tool to diagonise Repliaction StatusRepadmin.exe command-line tool assists administrators in diagnosing replication problems between Windows domain controllers. You can use Repadmin to view ...
http://www.chicagotech.net/server/repadmin1.htm
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
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How to Setup Windows, Network, VPN & Remote Access on
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"Daniel" <(E-Mail Removed)> wrote in message news:Omuhuk%(E-Mail Removed)...
In my network there are 2 DCs which are also GC and is in single domain
forest and do they replicate to each other ?
Daniel