Computer Networking
What layer of the OSI model would you assume the problem is in if you type show interface serial 1 and receive the following message? "Serial1 is down, line protocol is down."

Network layer
None. It is a router problem.
Physical layer
Data Link layer

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Computer Networking
Modulation is the process of

converting digital signals to analog signals
converting analog signals to digital signals
Multiplexing various signals into high speed line signals
performing data encryption.

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