Distributed System

Application imposes a variety of demands upon a communication system. These include procedure-consumer, client-server and group communication. They vary as to the quality of service required, that is delivery guarantees, bandwidth the latency, and security provided by the communication service.
Distributed operating system kernels normally provide message passing the send-receive combination and the Do Operation-Get Request-Send Reply combination. In some systems, however, Send is reliable. Where a system provides only one of the two models, it is on the grounds that it can be used to implement the other.

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