5.3 Identify and Describe Application Performance Issues SD-WAN-ENGINEER Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which statement correctly describes the impact of jitter on an application in an SD-WAN environment?

   • AJitter is the same as packet loss and causes data to be retransmitted.
   • BJitter is the variation in packet delay and can cause buffering or poor quality in real-time applications like VoIP and video.
   • CJitter only affects applications that use TCP, not UDP-based applications.
   • DJitter causes packets to arrive out of order, which is only noticeable in file transfers.
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A remote site uses a cloud-based ERP system. Users report that the system is slow, especially when generating reports. The SD-WAN shows the link has 60 ms latency and 0.5% packet loss. Which combination of symptoms best indicates a latency issue?

   • AIntermittent connectivity, because latency causes the link to drop.
   • BSlow report generation and delayed screen updates, because each request/response cycle is delayed by the round-trip time.
   • CPixelated video and choppy audio, because latency affects real-time media.
   • DFrequent timeouts and connection resets, because latency causes TCP to time out.
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A multinational company has sites in the US and Europe. They use a VoIP service for inter-site calls. The SD-WAN has two links: a transatlantic MPLS (100 ms latency) and a local internet breakout (20 ms latency to the VoIP provider's nearest PoP). The VoIP traffic is currently using the MPLS link. Users report echo and delay on calls. The administrator is considering switching VoIP to the internet breakout. What is the most important factor to evaluate before making this change?

   • AThe jitter and packet loss on the internet breakout link, as these are critical for voice quality and may be worse than on MPLS.
   • BThe cost savings of using the internet breakout, as the company wants to reduce WAN expenses.
   • CThe bandwidth capacity of the internet breakout, as VoIP requires a minimum amount of bandwidth.
   • DThe security policies on the internet breakout, as VoIP traffic may be more exposed to threats.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   An SD-WAN administrator notices that a critical business application is experiencing slow response times. Which symptom is a direct indicator of an application performance issue in the SD-WAN environment?

   • AThe application's user count has doubled in the last month.
   • BThe application's round-trip time (RTT) has increased significantly from the baseline.
   • CThe application's server CPU utilization is consistently below 30%.
   • DThe application's vendor has released a new software version.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A branch office uses a video conferencing system. Users report that the video freezes for a few seconds and then resumes. The SD-WAN shows the link has 0% loss and 5 ms jitter. Which application performance issue is most likely causing the freezes?

   • APacket loss, because even 0% loss can cause freezes if the network is congested.
   • BJitter, because even 5 ms jitter can cause the video player to buffer if the application is sensitive.
   • CLatency, because high latency causes the video player to buffer.
   • DBandwidth saturation, because the video stream consumes all available bandwidth.
   Reveal Solution Discussion Select an answer first