Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

The administrator is pinging from the interface.
No cable is attached.
The administrator has the interface shut down.
The keepalives are different times.

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Computer Networking
What is split horizon?

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

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Computer Networking
What does the passive command provide to dynamic routing protocols?

Stops the router from sending any dynamic updates.
Stops an interface from sending periodic dynamic updates but not from receiving updates.
Stops the router from receiving any dynamic updates.
Stops an interface from sending or receiving periodic dynamic updates.

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