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CCNP Routing and Switching Quick Reference Library: ROUTE 300-101, SWITCH 300-115, and TSHOOT 300-135 Quick References by Brent Stewart, Denise Donohue

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Chapter 3. Troubleshooting IP Networking

IP Address Assignment

This section describes issues regarding IP services and starts with a discussion about IP addressing. Even when Layer 2 connectivity is intact, failures at Layer 3 prevent communication.

IP addresses identify interfaces, not devices. The principal IP parameters are address, subnet mask, and (except on routers) default gateway. Addresses are unique, but a mask and gateway should be common on a subnet. Address information can be either statically assigned or obtained from Dynamic Host Configuration Protocol (DHCP).

When troubleshooting IP connectivity, refer to the following steps:

Step 1. Use traceroute to test connectivity or (if broken) the last point working in the path.

Step 2. ...

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