Please record your answer to the following true or false questions with short explanation . Circuit switched networks do not suffer from queueing...

Please record your answer to the following true or false questions with short explanation.

a.   Circuit switched networks do not suffer from queueing delay.

b.   Packet switching is used in computer networks because it is cheaper.

c.   POP3 is an example of "request-n-reply" application layer protocol.

d.   UDP packets carry the transport layer port numbers so that the end hosts can recover lost packets using the port numbers.

e.   The checksum used by UDP/TCP can catch all types of bit errors that might occur in data   transmission.