Your network contains an Active Directory domain. The domain contains four domain
controllers.
You modify the Active Directory schema.
You need to verify that all the domain controllers received the schema modification.
Which command should you run?

A.
dcdiag.exe /a

B.
netdom.exe query fsmo

C.
repadmin.exe /showrepl *

D.
sc.exe query ntds

Explanation:
http://blogs.technet.com/b/askds/archive/2009/07/01/getting-over-replmon.aspx
Getting Over Replmon
Status Checking Replmon had the option to generate a status report text file. It could tell you
which servers were configured to replicate with each other, if they had any errors, and so on.
It was pretty useful actually, and one of the main reasons people liked the tool.
Repadmin.exe offers similar functionality within a few of its command line options. For
example, we can get a summary report:
Repadmin /replsummary *

Several DCs have been taken offline. Repadmin shows the correct error of 58 – that the
other DCs are not available and cannot tell you their status.
You can also use more verbose commands with Repadmin to see details about which DCs
are or are not replicating:
Repadmin /showrepl *