Cisco
210-060 · Question #111
210-060 Question #111: Real Exam Question with Answer & Explanation
The correct answer is A: Calculated packet loss is too high.. A packet loss of 3% is well above the acceptable VoIP threshold of less than 1%, making it the primary cause of poor call quality in this scenario.
Question
A network engineer receives a report about poor quality on an active call between the IP phone of user A over the WAN to the IP phone of user B. Using web access to the phone, the network engineer remotely checks call statistics such as jitter, network delay, and packet loss. Calculated packet loss is 3%, average jitter is 20 ms, network delay is 1 ms, and conceal seconds is 7. What is the most likely problem with this call?
Options
- ACalculated packet loss is too high.
- BAverage jitter is too high.
- CNetwork delay is too high.
- DConceal seconds are too high.
Explanation
A packet loss of 3% is well above the acceptable VoIP threshold of less than 1%, making it the primary cause of poor call quality in this scenario.
Common mistakes.
- B. Average jitter of 20 ms is within acceptable limits - the common VoIP guideline is 30 ms or less - so jitter is not the primary problem contributing to the reported poor quality.
- C. Network delay of 1 ms is far below the ITU-T G.114 recommendation of 150 ms one-way maximum, making delay a non-factor in this call quality issue.
- D. Conceal seconds is a symptom metric reflecting how often the DSP must hide missing packets; it indicates packet loss is occurring but is not itself an independent root cause separate from the 3% packet loss already identified.
Concept tested. VoIP call statistics thresholds and packet loss interpretation
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/5125-tshoot-voice-quality.html
Community Discussion
No community discussion yet for this question.