Computer Networking
UDP is:

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

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

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

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