Computer Networking
UDP is:

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

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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
None of these

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Computer Networking
The main difference between synchronous and asynchronous transmission is

None of these
the pulse height is different.
the clocking is derived from the data in synchronous transmission
the clocking is mixed with the data in asynchronous transmission
the bandwidth required is different

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