Computer Networking
ASK, PSK, FSK, and QAM are examples of _____ encoding.

analog-to-digital
digital-to-digital
digital-to-analog
analog-to-analog
None of these

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Computer Networking
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

two bits or any even number of bits inverted in a byte during transmission
None of these
two bits or any even number of bits inverted in a block during transmission
one bit or any odd number of bits inverted in a byte during transmission
one bit or any odd number of bits inverted in a block of data during transmission

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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."

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

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