Computer Networking
TCP is:

Connection orientated and reliable
Connectionless and unreliable
Connection orientated and unreliable
Operates at the Data Link layer
None of these

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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Computer Networking
Demodulation is a process of

performing data description.
converting analog to digital signals
converting digital to analog signals
multiplexing various signals into one high speed line signals

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