Computer Networking
The main difference between TCP and UDP is

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

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Computer Networking
The packets switching concept was first proposed

in the late 1980s for the Defense Ministry of US.
in the early 1960s for military communication systems, mainly to handle speech
None of these
in the late 1950s for Defense Ministry of US
All of these

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