Diagnosing and debugging LAN congestion / connection issues

Posted by John Weldon on Server Fault See other posts from Server Fault or by John Weldon
Published on 2010-08-17T16:23:30Z Indexed on 2013/11/05 4:00 UTC
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networking

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switch

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lan

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tcpip

What are the top N tools / methodologies used to diagnose and repair network issues?

Given a LAN, for example, where users are able to consistently ping an outside server, but any data intensive connections are flaky; how would you begin solving the network issues?

I imagine issues like congestion, bandwidth constraints, throughput constraints, etc. are all factors, but I don't know how to diagnose those issues.

I'm especially interested in LAN environments (rather than WAN)

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