Computer Networking
UDP is:

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

None of these
the interface between the X.25 network and packet mode device
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
All of these

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