Conclusion
You should now have a good idea of which types of commands are available in the Cisco IOS that can be used for troubleshooting data link and network layer problems. The commands covered in this chapter apply to more than the interface types presented here. If you are not sure if the command that you want to use is available in the IOS for the particular interface type that you are troubleshooting, use the online help operator (the ?). The online help features of the IOS are very useful when troubleshooting and debugging problems.
To recap the steps to take in troubleshooting network problems:
Verify physical layer connectivity. This will be indicated by the interface up/down state. Things to look for here are cabling problems and ...
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