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[ 判断题 ] (2.0分) C2应用层英文en Local DNS name servers cache resource records, but discard them after a period of time.

A. True
B. FALSE

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[ 判断题 ] (2.0分) C2应用层英文enThe Date: header in the HTTP response message indicates when the object in the response was last modified.

A. True
B. FALSE

[ 判断题 ] (2.0分) C2应用层英文en Suppose that host A wants to send data over TCP to host B, and host B wants to send data to host A over TCP. Two separate TCP connections - one for each direction - are needed.

A. True
B. FALSE

Which of the following is used by the switch to forward frames? ( )

A. IP address
B. MAC address
C. port
D. socket

which of the following is not a class of multiple access protocol?

A. channel partitioning
B. random access
C. taking turns
D. flow control