Download Unit 9. Troubleshooting

Instructor Notes:
Purpose — Provide an overview of what commands we will cover and for what purpose they
can be used.
Details — Since the unit tends to be a collection of commands students often lose sight of the big
picture — what we are trying to accomplish with these commands. This overview can be used to
put the various commands into perspective of how they can be used. The discussion starts with
how to document the system using the Iscfg, Isdev, Isattr, ifconfig and no commands. Then we
will move into the commands that help in problem determination and isolation. Since some of
these commands can aid in several areas be sure to mention those already covered, like ifconfig
and no, in the appropriate places. There will be only one foil for each command, except netstat
which we'll show a foil for each of several options, so feel free to refer back to previously covered
commands when you are discussing the new area such as problem determination and tuning.
Transition Statement — In order to begin problem determination at the hardware layer, a good
picture of the hardware in the network and its configuration when it is working is important to have.
Let's look at some commands to help capture this information.