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
When upper-layer protocols require high reliability
During high-traffic periods
In an improperly implemented redundant topology

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Computer Networking
TCP is:

Operates at the Data Link layer
Connection orientated and unreliable
Connectionless and unreliable
None of these
Connection orientated and reliable

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