What's the difference between DCdiag and NETdiag?

I ahve 2 questions here..
1. What's the difference between DCdiag and NETdiag?

2. I know how to run them, but how does the result help me troubleshoot the problem? For example, run DCdiag, netlogon failed. How can I troubleshoot the problem?
But shouldn't this can be found in event log? why we need to run DCdiag?
same example as if I run NETdiag, I see Domain membership test failed. I am also able to see it in event log right?
wuitsungAsked:
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coolsport00Connect With a Mentor Commented:
DCDiag is more of a DC diagnostic tool to test replication, etc. A very good quick reference. Yes, you will get events logged into Event Viewer, but this is a good overall, quick replication test for your organization:
http://technet2.microsoft.com/windowsserver/en/library/5237db58-a1e8-40cd-ae8a-7f52848a90f21033.mspx?mfr=true

NetDiag is a network/connectivity diagnostic tool:
http://technet2.microsoft.com/windowsserver/en/library/cf4926db-87ea-4f7a-9806-0b54e1c00a771033.mspx?mfr=true

Based off the info displayed by running the tools, you can isolate areas of concern and troubleshoot.

Regards.
~coolsport00
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ChiefITConnect With a Mentor Commented:
It is true that most DCdiag errors and Netdiag errors show up in event logs, but not always.

Netdiag looks at the configuration of networking settings, while DCdiag looks at key 2003 server services.

If you are showing errors on a DCdiag report or netdiag report, you can post the errors on EE and ask a question on how to resolve them.
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wuitsungAuthor Commented:
Thanx coolsport00, So you pointed out that DCdiag is for test replication? that's the only purpose? And one more question... even that it show you failed messsage, how do you kow where is the problem to fix and how to fix it?
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coolsport00Connect With a Mentor Commented:
Well, that's the main purpose; as you can see from the article, it's a "DC Testing tool". It tests sysvol, replication, etc., which has much meaning to them. In other words, if replication isn't working, then when you create accts, the data doesn't propigate to other DCs, Group Policies won't apply correctly, etc., etc. You can see the implications. :)

For the DCDiag, when it shows "failed", it will show where specifically if you look closely at the output. From there you can get a good idea where to begin your troubleshooting. The same with NETDiag (though I will honestly say I haven't used that tool much).

Hope that helps...

Regards.
~coolsport00
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