5.3 Identify and Describe Application Performance Issues SD-WAN-ENGINEER Practice Questions (Page 3)

Questions 11–14

1. 11application · medium

   A user at a remote site complains that video conferencing is blurry and freezes, but email and file downloads are fine. The SD-WAN appliance shows the primary link has 2% packet loss and 15 ms jitter. Which description best characterizes the impact of these metrics on the video conference?

   • AThe metrics are within normal ranges for video, so the issue is likely a local device problem, not the WAN link.
   • BThe packet loss is the only issue because jitter is within acceptable limits for video, so the video freezes but does not blur.
   • CThe packet loss causes video frame drops and the jitter causes out-of-order or delayed packets, leading to blurry and frozen video.
   • DThe jitter is the only issue because packet loss is below the 5% threshold, so the video quality is mainly affected by delay variation.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   An SD-WAN engineer is troubleshooting a VoIP application that has poor call quality. Which metric would most directly indicate a network-related performance issue?

   • AThe average CPU load on the VoIP server
   • BThe number of active VoIP calls on the network
   • CThe number of switches in the branch office
   • DThe percentage of packets lost between the branch and the data center
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A branch office uses a cloud-based video surveillance system. The system streams video to a central monitoring center. Users report that the video is pixelated and sometimes freezes. The SD-WAN shows the link has 3% packet loss and 20 ms jitter. Which description best explains the impact of these metrics on the video stream?

   • AJitter is the primary issue because packet loss is below 5%, so the video only freezes but does not pixelate.
   • BThe metrics are within normal ranges for video streaming, so the issue is likely a local network problem.
   • CPacket loss causes missing video frames, while jitter causes the video player to buffer, resulting in pixelation and freezes.
   • DPacket loss is the primary issue because jitter is within acceptable limits, so the video is pixelated but does not freeze.
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A user reports that a cloud-based application is slow to respond. The SD-WAN shows the link has 100 ms latency and 1% packet loss. Which description best characterizes the combined impact of these metrics on the application?

   • AThe packet loss is the primary issue because latency is within acceptable limits for most applications.
   • BThe high latency delays each request, and the packet loss causes retransmissions, both contributing to slow response times.
   • CThe metrics are within normal ranges, so the issue is likely a local device problem.
   • DThe latency is the primary issue because packet loss is below 2%, so the application is mainly affected by delay.
   Reveal Solution Discussion Select an answer first