A packet switching network may provide a variety of levels of service, depending upon the sophistication of the underlying communication technology and the requirements of the network's customers. The simplest packet switching networks provide only datagram service, which is unordered unreliable delivery of packets. Other networks may provide only reliable individually flow-controlled virtual circuits. The decision between datagrams, virtual circuits, or other modes of operation can be made independently for the internal operation of a packet switching network, and the interface that it presents to its customers. See also cell, frame.
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