Administratively Controlling Interface State with shutdown
As you might imagine, network engineers need a way to bring down an interface without
having to travel to the switch and remove a cable. In short, we need to be able to decide
which ports should be enabled and which should be disabled.
In an odd turn of phrase, Cisco uses two interface subcommands to configure the idea of
administratively enabling and disabling an interface: the shutdown command (to disable) and
the no shutdown command (to enable). While the no shutdown command might seem like
an odd command to enable an interface at first, you will use this command a lot in the lab,
and it will become second nature. (Most people, in fact, use the abbreviations shut and no
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