Cisco 400-051 Exam

Which two are characteristics of jitter buffers? (Choose two.)

  • A. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by turning variable network delays into constant delays at the destination end systems.
  • B. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by turning variable network delays into constant delays at the sending systems.
  • C. The role of the jitter buffer is to balance the delay and the probability of interrupted playout due to late packets.
  • D. The role of the jitter buffer is to queue late packets and reorder out-of-order packets.
  • E. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by queuing packets into constant delays at the sending systems.
Answer: Option A. C.
Explanation: 

Jitter buffers are used to remove the effects of jitter so that asynchronous packet arrivals are changed to a synchronous stream. The jitter buffer trades off between delay and the probability of interrupted playout because of late packets (discard).
Reference: http://www.appneta.com/blog/jitter-voip/

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