A session also is the basic step to transmit in connectionless communication modes.
2.
The connectionless communications has the advantage over connection-oriented communications in that it has low overhead.
3.
The " fast select with restricted response facility " is intermediate between full call establishment and connectionless communication.
4.
Under connectionless communication between two network end points, a message can be sent from one end point to another without prior arrangement.
5.
For connectionless communications, one party ( " server " ) is usually waiting for an incoming packet, and another party ( " client " ) is usually understood as the one which sends an unsolicited packet to " server ".
6.
For example, a datagram socket can be used for connectionless communication, and a multicast socket can be used to send to multiple nodes, or an address range where there may or may not be any nodes to receive data.
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