To determine what Domain Controllers are in your domain, run netdom query dc.

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To determine whether there are any issues with replication between Domain Controllers, run repadmin /replsum.

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If you want to test whether a domain controller is available, run nltest /dsgetdc:domainname.com

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To check which Domain Controller you are authenticating against (connected to) run, set logon

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For additional information about the currently logged on user run set u

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To test DNS in your environment run dcdiag /test:DNS

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For more extensive information use dciag /V 

To check Windows Time Service use w32tm /query /status.
To determine WTS source use w32tm /query /source.

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