Computer Networking
The main difference between TCP and UDP is

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

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Computer Networking
Modulation is the process of

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

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