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352-001 · Question #118
352-001 Question #118: Real Exam Question with Answer & Explanation
The correct answer is D: Minimizing total unidirectional end-to-end delay to 0-150 ms. VoIP quality is governed by ITU-T G.114, which defines the acceptable one-way (unidirectional) end-to-end delay budget as 0 to 150 ms.
Question
What is a key design aspect to be considered when designing an IP network that will be carrying real-time VoIP traffic?
Options
- AMinimizing total bidirectional end-to-end delay to 0-150 ms
- BMinimizing total unidirectional end-to-end delay to 150-500 ms
- CMinimizing total bidirectional end-to-end delay to 0-50 ms
- DMinimizing total unidirectional end-to-end delay to 0-150 ms
Explanation
VoIP quality is governed by ITU-T G.114, which defines the acceptable one-way (unidirectional) end-to-end delay budget as 0 to 150 ms.
Common mistakes.
- A. Bidirectional delay is not the correct measurement unit in ITU-T G.114; the standard measures one-way delay, and 0-150 ms bidirectional would be an impossibly strict and non-standard requirement.
- B. While the direction (unidirectional) is correct, a range of 150-500 ms exceeds the G.114 maximum threshold of 150 ms for acceptable voice quality.
- C. A 0-50 ms bidirectional target uses the wrong direction metric and is more stringent than any recognized VoIP delay standard.
Concept tested. VoIP unidirectional delay requirements per ITU-T G.114
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/14036-qos-voip.html
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