Computer Networking
A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

Decrease the sequence number.
Decrease the window size.
Send a different source port number.
Restart the virtual circuit.

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued to ISO.
None of these

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