The objective of various Internet QoS efforts is to augment a best-effort service with a number of
selectable service responses. We can juggle with the two basic actions of an active network router:
queuing and discarding. Packets queued at the head of a queue should be processed faster than those
queued at the end of the queue. And if a switch has to discard a packet, then some QoS-related rule set
may be used to select which particular packet is the preferred candidate for discarding. In altering the
queuing and discard behaviours selectively, service outcomes that differ from the best-effort service
may be generated. These 'tailored services' may have lower average end-to-end delay, lower jitter, or
greater bandwidth. These service responses are relative, where the service outcome is claimed to be no
worse than best-effort at any time, and superior to best-effort under conditions of congestion load.
The objective of various Internet QoS efforts is to augment a best-effort service with a number ofselectable service responses. We can juggle with the two basic actions of an active network router:queuing and discarding. Packets queued at the head of a queue should be processed faster than thosequeued at the end of the queue. And if a switch has to discard a packet, then some QoS-related rule setmay be used to select which particular packet is the preferred candidate for discarding. In altering thequeuing and discard behaviours selectively, service outcomes that differ from the best-effort servicemay be generated. These 'tailored services' may have lower average end-to-end delay, lower jitter, orgreater bandwidth. These service responses are relative, where the service outcome is claimed to be noworse than best-effort at any time, and superior to best-effort under conditions of congestion load.
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