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Windows Vista Security: Praxisorientierte Sicherheit für Profis by Marcus Nasarek

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Troubleshooting Common Problems on Small Networks
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Checking Physical Connectivity
Using the functionality of the OSI model, you can identify where protocols function
to aid in troubleshooting network problems. If you are unable to connect to a net-
work, you should begin at the layer 1 level. This layer tells you to look specifically at
the physical connectivity of your computer to the network. Identifying whether your
cabling works correctly should be the first step of network troubleshooting. You can
usually verify that you have physical connectivity by making sure that the link light is
lit on the network adapter. Usually if your link light is lit and the activity light is
showing activity by flashing, you can assume physical connectivity. If you complete
the troubleshooting steps in the section but you still have issues connecting to the
network properly, replace the network cable. If you have doubts as to whether you
have connectivity, take a few minutes to replace the network cable, as it is easy and
inexpensive to replace this piece of equipment. Telltale signs that you need to replace
your cable include no link light when connected to a powered-on network device,
and the fact that you can either only send or only receive data.
If you have verified that you have physical connectivity, you must determine whether
the network adapter exists within Device Manager on your computer. If your com-
puter sees the network adapter, verify that you have the latest driver installed. Some-
times you can have problems with network functionality due to an old device driver
associated with the network adapter. This scenario can happen after a software
update to the operating system and when a third-party application makes changes to
a shared control file, or to a file the driver relies upon for quality communications. If
Figure 14-13. Diagnosing your networking problem

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