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210-065 · Question #109
210-065 Question #109: Real Exam Question with Answer & Explanation
The correct answer is A: RTCP. RTCP (Real-time Transport Control Protocol) is the companion protocol to RTP that provides out-of-band quality metrics such as jitter, packet loss, and delay for active voice calls.
Question
Which protocol is used to monitor active voice call quality?
Options
- ARTCP
- BRTP
- CQoS
- DSTP
- ESDP
Explanation
RTCP (Real-time Transport Control Protocol) is the companion protocol to RTP that provides out-of-band quality metrics such as jitter, packet loss, and delay for active voice calls.
Common mistakes.
- B. RTP (Real-time Transport Protocol) carries the actual encoded voice media payload between endpoints but does not provide quality measurement or reporting functions.
- C. QoS is a broad framework of policies and mechanisms for traffic prioritization, not a protocol that actively monitors or reports on call quality metrics.
- D. STP (Spanning Tree Protocol) operates at Layer 2 to prevent switching loops in Ethernet networks and has no role in voice call quality monitoring.
- E. SDP (Session Description Protocol) is used during signaling to negotiate media parameters such as codec and port before a call is established, not to monitor quality during an active call.
Concept tested. RTCP for real-time voice call quality monitoring
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-rtprtcp-use.html
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