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Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

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Network Infrastructure Discovery

Your first task in discovering how a TCP/IP network is laid out is to identify the “glue” of the network—the routers! The easiest way to discover the routers on your network is to go to a functional workstation and server and check the TCP/IP configuration. Go to several in different locations, particularly if you’re not sure whether you have multiple VLANs or other data link segmenting mechanisms.

Router Configuration

Can you use Telnet or SSH to access the router? Or, does it have a Web interface? Being able to access the router’s native configuration interface is totally ideal; you can gather whatever information you need.

Oh, no! It’s asking for a password. Hopefully, because you own this router, you have ...

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