User datagram protocol provides a connectionless service for application level procedures. Hence it is an unreliable service. Though it is a connectionless service, it is still used because it does not involve the overhead of connection establishment, maintenance etc.
In a real time monitoring system, the loss of a data unit occasionally, would not harm much because the next report would arrive very shortly. It involves active or passive sampling of data sources such as sensor, network components etc periodically.
The outward data disseminations Involve broad casting messages to users about the inclusion of a mode or change of address of a mode etc.
The server keeps receiving the requests from a number of clients for various applications which are serviced depending upon the availability of the server.
In these applications, we cannot use connection oriented features such as re-transmission etc.
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