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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.

Call Control

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)
  • A
    3% (1)
  • B
    3% (1)
  • C
    94% (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.

Agreedy

Voice is not greedy; it uses a constant, predetermined codec bit rate rather than attempting to seize all available bandwidth.

BTCP retransmits

Voice uses UDP, so TCP retransmission mechanisms do not apply; retransmitting lost voice packets would worsen latency and quality rather than improve it.

CUDP priorityCorrect

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.

Ddelay sensitiveCorrect

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.

Edrop insensitive

Voice is drop sensitive because packet loss causes audible artifacts such as clicks or silence; even small loss percentages degrade perceived quality.

FbenignCorrect

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.

Gbenign or greedy

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

Topics

#voice QoS#UDP priority#delay sensitive#benign traffic

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