Troubleshooting poor voice quality on a Cisco VoIP network? Learn why checking QoS configuration is critical for prioritizing voice traffic and ensuring high call quality, a key topic for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
A technician is troubleshooting poor voice quality on a Cisco VoIP network. What network setting should be checked?
A. MAC address table
B. Access control lists
C. QoS configuration
D. MTU size
E. Static IP configuration
Answer
C. QoS configuration
Explanation
Quality of Service (QoS) ensures that voice traffic is prioritized over other types of network traffic, reducing latency and jitter.
The network setting that should be checked is the QoS (Quality of Service) configuration.
QoS is essential for VoIP networks because it prioritizes voice traffic over less critical data, ensuring that voice packets receive the necessary bandwidth and minimal delay. Proper QoS configuration reduces latency, jitter, and packet loss—factors that directly impact voice clarity and call reliability. Without QoS, voice packets may compete with other types of traffic, leading to degraded call quality, dropped calls, and poor user experience.
Key aspects of QoS for VoIP include:
- Prioritizing RTP and SIP traffic to guarantee timely delivery.
- Reserving bandwidth specifically for voice communications.
- Minimizing packet delay variation (jitter) and packet loss.
Checking and optimizing QoS settings ensures voice traffic is prioritized, reducing latency, jitter, and packet loss, which are the primary causes of poor voice quality in VoIP networks.
Cisco Certified Field Technician (CCT) certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Field Technician (CCT) exam and earn Cisco Certified Field Technician (CCT) certification.