Computer Networking
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Flood the network with the frame
Discard it and send an error message back to the originating host
Add the source address and port to the MAC address table and forward the frame out the destination port
Add the destination to the MAC address table and then forward the frame

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Computer Networking
HDLC (High-level Data Link Control) is

a method of determining which device has access to the transmission medium at any time
None of these
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO.

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

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