"The physical layer, layer 1, is too often ignored in a
classroom setting. It may seem simple, but there are aspects of the
first layer that oftentimes demand significant attention. Layer one
is simply wiring, fiber, network cards, and anything else that is
used to make two network devices communicate. Even a carrier pigeon
would be considered layer one gear (see RFC 1149). Network
troubleshooting will often lead to a layer one issue. We can't
forget the legendary story of CAT5 strung across the floor, and an
office chair periodically rolling over it leading to spotty network
connectivity. Sadly, this type of problem is quite common, and
takes the longest to troubleshoot."
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