Computer Networking
Which of the following condition is used to transmit two packets over a medium at the same time?

Synchronous
Contention
Asynchronous
None of these
Collision

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

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

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