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Chapter 5
Applying Cisco's Diagnostic Tools
F I G U R E 5 . 8
Token Ring topology
You can see that from the Token Ring NIC on the station, the lobe wire
connects to a multistation access unit, or MAU. The MAU is similar to an
Ethernet hub. Therefore, there are three physical pieces to look at: NIC,
cable, and MAU.
The action plan is to inspect each of these elements. Start with the easiest
part--inspect the cable, inspect the MAU, and then inspect the NIC.
Assume that the NIC is functioning properly, and the cable tested clean.
That leaves the MAU. There can be two problems: the cable connection
between the NIC and MAU was not connected properly, or there can be
something wrong with the MAU itself. The MAU can have a variety of prob-
lems--it can have a bad port or it may not have been initialized.
The action plan is to reconnect the cable, change ports on the MAU, and
verify that the MAU has been initialized.
Once the physical problem is resolved, the interface should change to
interface up. The line protocol status depends on whether there are existing
problems with the configuration.
Summary
T
he chapter was dedicated to exposing you to common problems that
you can encounter with routers, Ethernet, and Token Ring. These scenarios
all dealt with configuration problems or physical media issues. Although the
majority of problems were found to be on Layer 2 and Layer 1, some were
Layer 3 problems.
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