Learn how configuring QoS settings can fix poor VoIP call quality, including jitter and dropped calls, for the CompTIA A+ Core 1 220-1101 exam. Understand the impact of network congestion on VoIP and why prioritizing voice traffic is essential in wired networks.
Table of Contents
Question
A user reports that their VoIP phone has poor call quality, with jitter and dropped calls. The network is wired, and other devices are unaffected. What should the technician configure to resolve this?
A. VLAN tagging
B. QoS settings
C. Static IP address
D. DNS caching
E. Port forwarding
Answer
B. QoS settings
Explanation
Poor VoIP call quality (jitter, dropped calls) is often due to network congestion. Configuring Quality of Service (QoS) settings to prioritize VoIP traffic ensures better performance for time-sensitive voice data.
Jitter and dropped calls on a VoIP phone, especially when the network is wired and other devices are unaffected, are classic symptoms of network congestion affecting voice traffic. Quality of Service (QoS) is designed to address this by prioritizing VoIP packets over other types of network data. When QoS is enabled and properly configured on network equipment (such as routers and switches), it ensures that time-sensitive voice packets are transmitted with minimal delay, reducing jitter and preventing dropped calls.
This is critical for maintaining clear, reliable VoIP communication because voice data is highly sensitive to packet loss, latency, and inconsistent delivery times.
Other solutions like VLAN tagging, static IP addresses, DNS caching, or port forwarding do not directly address the need to prioritize VoIP traffic or manage network congestion for voice quality.
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