Computer Networking
Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?

UDP
VMTP
SMTP
X.25
None of these

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

None of these
network access standard for connecting stations to a circuit-switched network
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.
a method access control technique for multiple-access transmission media

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