Computer Networking
The main difference between TCP and UDP is

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

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Computer Networking
RS-449/442-A/423-A is

a set of physical layer standards developed by EIA and intended to replace RS-232-
the ratio of the number of data units in error to the total number of data units
None of these
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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