Some colleagues are discussing QoS, and are interested in jitter. What is jitter?

1.   Jitter refers to the variation in delay experienced by packets.
2.   Jitter is a clicking noise that can be heard on some VoIP calls. It is caused by loss of UDP packets.
3.   Jitter is a flickering effect sometimes seen on streaming video.
4.   Jitter is a predefined settings package that provides optimal QoS for IP telephony use.

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