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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Shooting Trouble with Ethernet

Shooting trouble with Ethernet primarily requires you to deal with the Physical and Data Link Layers of the OSI model. I will not change the methodology on you here. Layer 2 depends on Layer 1. You will have an opportunity to prove it yourself if you haven't already.

There are lots of things to check to assist you with narrowing down the possible causes of a problem. Suppose, for example, that you can ping a local host but not a remote one. This could be a routing or routed protocol issue, but it may in fact be a link problem. Next you could ping from a different host or source the ping from a different interface on the router. Perhaps the route is fine, the local router is okay, and the links to the destination ...

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