100-140 Question 38
Select 2You are troubleshooting a network performance issue for a client and decide to adjust the Quality of Service (QoS) settings on a router to prioritize VoIP traffic. After making the changes, you observe the network behavior. Which of the following observations would indicate that the QoS changes were successful?
- A
VoIP call quality improves with fewer dropped packets and lower latency.
- B
File transfer speeds over FTP are significantly faster.
- C
Video streaming services experience no buffering or lag.
- D
CPU utilization on the router spikes to 100% consistently.
- E
Ping tests to the VoIP server now show reduced latency compared to before the change.
Show answer and explanation
Correct answers: A, E
Explanation
Quality of Service (QoS) changes are made to prioritize specific types of traffic, in this case VoIP, over others. Successful implementation of QoS would result in improved VoIP performance, such as better call quality and reduced latency. Observations like reduced latency to the VoIP server and improved call quality confirm the changes were effective. Other network behaviors, such as FTP speed or video streaming, are not directly related to the success of the QoS configuration for VoIP traffic.
- A. Correct.
Correct: Improved VoIP call quality with fewer dropped packets and lower latency indicates that traffic prioritization is working as intended for VoIP.
- B. Incorrect.
Incorrect: QoS changes prioritizing VoIP traffic do not directly impact FTP transfer speeds unless specifically configured for FTP traffic.
- C. Incorrect.
Incorrect: While video streaming might benefit indirectly from reduced congestion, this is not a direct indicator of successful QoS changes for VoIP.
- D. Incorrect.
Incorrect: A consistent spike in CPU utilization to 100% could indicate a problem with the router, not a successful QoS configuration.
- E. Correct.
Correct: Reduced latency during ping tests to the VoIP server is a direct and measurable outcome of QoS prioritization for VoIP traffic.