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

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

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the clocking is mixed with the data in asynchronous transmission
the pulse height is different.
the clocking is derived from the data in synchronous transmission
None of these
the bandwidth required is different

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