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."

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

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the pulse height is different.
the clocking is derived from the data in synchronous transmission
the bandwidth required is different
None of these
the clocking is mixed with the data in asynchronous transmission

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Computer Networking
"BAUD" rate means

None of these
The number of bits transmitted per unit time.
The number of bytes transmitted per unit time.
The rate at which the signal changes.

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