220-1201 · Question #425
Users in a 200-person call center report that phone calls experience severe performance degradation on busy days. The technician confirms: - Upload and download speeds are 50Mbps during a speed…
The correct answer is D. The bandwidth dedicated to the call center is insufficient. Voice over IP (VoIP) traffic is highly sensitive to latency, jitter, and packet loss, especially in large environments such as a 200-person call center. Although the technician confirms that VoIP prioritization (QoS) is configured correctly and speed tests show 50 Mbps upload…
Question
Users in a 200-person call center report that phone calls experience severe performance degradation on busy days. The technician confirms:
- Upload and download speeds are 50Mbps during a speed test.
- VoIP call prioritization settings are properly configured for the
VLAN that the call center uses. Which of the following is most likely the cause of this issue?
Options
- AThe QoS is not configured correctly on the router.
- BThe switchports dedicated to the call center are flapping.
- CThe call center's VLAN is not configured to allow voice traffic.
- DThe bandwidth dedicated to the call center is insufficient.
How the community answered
(64 responses)- A22% (14)
- B5% (3)
- C8% (5)
- D66% (42)
Explanation
Voice over IP (VoIP) traffic is highly sensitive to latency, jitter, and packet loss, especially in large environments such as a 200-person call center. Although the technician confirms that VoIP prioritization (QoS) is configured correctly and speed tests show 50 Mbps upload and download speeds, overall available bandwidth can still be insufficient during peak usage. Speed tests measure raw throughput at a point in time and do not reflect real-world congestion caused by hundreds of simultaneous calls, application usage, and data transfers. On busy days, the cumulative bandwidth demand likely exceeds the available capacity, leading to degraded call quality despite correct VLAN and QoS settings.
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