Computer Networking
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

In an improperly implemented redundant topology
After broken links are reestablished
During high-traffic periods
When upper-layer protocols require high reliability

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

a method access control technique for multiple-access transmission media
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.

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