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

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

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Computer Networking
A WATS arrangement

is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
None of these
is never less expensive than flat-rate service
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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