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

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Computer Networking
HDLC (High-level Data Link Control) is

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

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