Computer Networking
UDP is:

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

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

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

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