Repadmin is the tool used in Active Directory Replication. And here is the quiz on it. Good Luck and have a great learning experience with this quiz.
Is Replication happens in Push or Pull method?
Do you know Active Directory Replication works on?
What is the command to replicate DC’s forcefully?
What is the command to check only replication errors?
Command to check how many items are in the queue to be replicated.
Check here for Active Directory Quiz #1