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

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
the virtual circuit interface to packet-switched service

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Computer Networking
What is a stub network?

A network with more than one exit and entry point.
A network with only one entry and no exit point.
A network with more than one exit point.
A network that has only one entry and exit point.

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