350-801 · Question #310
What are two QoS requirements for VoIP traffic? (Choose two.)
The correct answer is A. Loss must be no more than 1 percent. D. Voice traffic must be marked to DSCP EF.. VoIP traffic requires specific QoS parameters to ensure high quality, including minimal packet loss and appropriate DSCP marking for prioritization.
Question
What are two QoS requirements for VoIP traffic? (Choose two.)
Options
- ALoss must be no more than 1 percent.
- BVoice traffic must be marked to DSCP AF41.
- COne-way latency must be no more than 200 ms.
- DVoice traffic must be marked to DSCP EF.
- EAverage one-way jitter is greater than 50 ms.
How the community answered
(25 responses)- A88% (22)
- C8% (2)
- E4% (1)
Why each option
VoIP traffic requires specific QoS parameters to ensure high quality, including minimal packet loss and appropriate DSCP marking for prioritization.
For optimal voice quality, packet loss for VoIP traffic should be kept to a minimum, typically no more than 1 percent, to prevent perceptible gaps or degradation in conversations.
DSCP AF41 is typically used for real-time applications like video conferencing, not the primary marking for standard voice traffic.
A one-way latency of 200 ms is generally considered too high for good VoIP quality, with recommendations often aiming for 150 ms or less.
Voice traffic should be marked with DSCP Expedited Forwarding (EF) to ensure it receives premium treatment and minimal latency and jitter across the network.
Average one-way jitter should be less than 30 ms for good VoIP quality, not greater than 50 ms.
Concept tested: VoIP QoS parameters and DSCP marking
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Voice_and_Video/DVCT/DVCT_Chap3.html
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