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

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Computer Networking
Which of the following is true when describing a unicast address?

These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.
Packets addressed to a unicast address are delivered to a single interface.
These are like private addresses in IPv4 in that they are not meant to be routed.

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Computer Networking
Contention is

the condition when two or more stations attempt to use the same channel at the same time
None of these
One or more conductors that serve as a common connection for a related group of devices
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

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