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

All of these
the virtual circuit interface to packet-switched service
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
None of these

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Computer Networking
UDP is:

Connection orientated and reliable
Not a part of the TCP/IP suite
None of these
Connectionless and unreliable
Connection oriented and unreliable

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