Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality of voice calls? (Choose two.)

Question

Options

• AIncrease the queue size of the voice class.
• BGuarantee bandwidth during congestion to the voice class with a bandwidth command.
• CIncrease the tx-ring of the egress interface.
• DImplement LLQ for the voice class.
• EDecrease the rx-ring of the egress interface.
• FDecrease the queue size of the voice class.

• B
  6% (2)
• C
  3% (1)
• D
  81% (29)
• E
  11% (4)

Explanation

D is correct: Low Latency Queuing (LLQ) creates a strict priority queue for voice traffic. Voice packets in the priority queue are always serviced before any other queue, which directly minimizes delay and jitter - the root causes of the poor voice quality described. F is correct: decreasing the queue size for the voice class reduces the maximum number of packets that can wait in the queue, which reduces queuing delay and jitter. Conversely, increasing the queue size (A) worsens delay. The bandwidth command (B) guarantees minimum bandwidth but does not provide the strict priority needed to minimize latency. Increasing the tx-ring (C) adds buffering and increases delay. Decreasing the rx-ring (E) affects ingress buffering, not egress queuing delay for voice.

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