Computer Networking
A front-end processor is

a processor in a large-scale computer that executes operating system instructions
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
preliminary processor of batch jobs.
a user computer system
None of these

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Computer Networking
The main difference between TCP and UDP is

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

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