Computer Networking
Modulation is the process of

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

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Computer Networking
TCP is:

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

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Computer Networking
The main difference between TCP and UDP is

UDP is connection oriented where as TCP is datagram service
UDP is a datagram where as TCP is a connection oriented service
All of these
TCP is an Internet protocol where as UDP is an ATM protocol
None of these

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