Computer Networking
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

3, 3, 2, none
3, 2, 1, 7
3, 2, 1, none
3, 3, 1, 7
All of these

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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 method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO.
None of these
network access standard for connecting stations to a circuit-switched network

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