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
During high-traffic periods
After broken links are reestablished
When upper-layer protocols require high reliability

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Computer Networking
The network layer, in reference to the OSI model, provide

the interface between the X.25 network and packet mode device
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
the virtual circuit interface to packet-switched service

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