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

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

All of these
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received
the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device

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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 administrator is pinging from the interface.
The keepalives are different times.

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