Computer Networking
What command will permit SMTP mail to only host 1.1.1.1?

access-list 110 permit ip smtp host 1.1.1.1
access-list 10 permit tcp any host 1.1.1.1 eq smtp
access-list 10 permit smtp host 1.1.1.1
access-list 110 permit tcp any host 1.1.1.1 eq smtp

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
It splits the traffic when you have a large bus (horizon) physical network.
Information about a route should not be sent back in the direction from which the original update came.
It prevents regular update messages from reinstating a route that has gone down.

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Computer Networking
Bus is

None of these
a continuous frequency capable of being modulated or impressed with a second signal
a collection of interconnected functional units that provides a data communications service among stations attached to the network
one or more conductors that some as a common connection for a related group of devices
the condition when two or more stations attempt to use the same channel at the same time

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