210-060 · Question #196
Which three characteristics are associated with voice? (Choose three.)
The correct answer is C. UDP priority D. delay sensitive F. benign. Voice traffic is UDP-based for low latency, highly delay sensitive, and benign because it consumes a fixed, predictable amount of bandwidth.
Question
Which three characteristics are associated with voice? (Choose three.)
Options
- Agreedy
- BTCP retransmits
- CUDP priority
- Ddelay sensitive
- Edrop insensitive
- Fbenign
- Gbenign or greedy
How the community answered
(33 responses)- A3% (1)
- B3% (1)
- C94% (31)
Why each option
Voice traffic is UDP-based for low latency, highly delay sensitive, and benign because it consumes a fixed, predictable amount of bandwidth.
Voice is not greedy; it uses a constant, predetermined codec bit rate rather than attempting to seize all available bandwidth.
Voice uses UDP, so TCP retransmission mechanisms do not apply; retransmitting lost voice packets would worsen latency and quality rather than improve it.
Voice uses UDP because TCP retransmissions would introduce variable and unacceptable delay; in QoS policy, UDP-based voice traffic is assigned high priority to ensure timely delivery and low jitter.
Voice is delay sensitive and must meet strict end-to-end one-way latency requirements (under 150 ms per ITU-T G.114); any queuing or transmission delay directly degrades call quality.
Voice is drop sensitive because packet loss causes audible artifacts such as clicks or silence; even small loss percentages degrade perceived quality.
Voice codecs operate at a fixed bit rate, so voice traffic is classified as benign - it uses only the bandwidth it needs and does not attempt to expand consumption the way bulk data transfers do.
Voice is strictly benign, not a mix of benign and greedy; its fixed codec rate makes bandwidth consumption entirely predictable and non-aggressive.
Concept tested: Voice traffic QoS characteristics - delay sensitivity, UDP, benign behavior
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_classn/configuration/xe-16/qos-classn-xe-16-book/qos-classn-mrkg-fundmnts.html
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