Computer Networking
IEEE project 802 divides the data link layer into an upper _____ sublayer and a lower _____ sublayer.

None of these
PDU, HDLC
MAC, LLC
LLC, MAC
HDLC, PDU

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Computer Networking
A front-end processor is

a minicomputer that relieves main-frame computers at a computer centre of communications control functions
preliminary processor of batch jobs.
a processor in a large-scale computer that executes operating system instructions
None of these
a user computer system

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