Computer Networking
Which of the following types of channels moves data relatively slowly?

None of these
voiceband channel
narrowband channel
broadband channel
wideband channel

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

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

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