9. Explain the Impacts of Network Constraints on Applications 200-901 Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A remote backup application transfers large files over a WAN link that has a high bit error rate. Users report that backups take much longer than expected. The application uses TCP. What is the most likely cause of the slowdown?

   • AThe WAN link is not full-duplex.
   • BThe application is not using enough TCP connections.
   • CThe backup application is CPU-bound on the server.
   • DPacket loss causes TCP retransmissions and congestion window reduction.
   Reveal Solution Discussion Select an answer first
2. 42expert · hard

   A network administrator is troubleshooting poor VoIP quality. The network has a jitter buffer configured on the IP phones. The administrator notices that the jitter buffer is set to 50 ms, but the network jitter is averaging 80 ms. What is the most likely result?

   • AThe jitter buffer will reduce the delay, improving call quality.
   • BThe jitter buffer will increase its size dynamically to handle the jitter.
   • CPackets arriving later than 50 ms will be dropped, causing choppy audio.
   • DThe jitter buffer will absorb the jitter, and call quality will be fine.
   Reveal Solution Discussion Select an answer first
4. 43application · medium

   A company uses a UDP-based streaming application for live video broadcasts. The network has occasional packet loss. What is the most likely impact on the application?

   • AThe application will reduce its sending rate to avoid further loss.
   • BThe video quality will degrade because lost packets are not retransmitted.
   • CThe application will switch to TCP automatically to recover the lost data.
   • DThe application will retransmit lost packets, causing delays.
   Reveal Solution Discussion Select an answer first
5. 44expert · hard

   A multinational company is designing a network for a latency-sensitive application that replicates data between data centers in New York and London. The application requires a maximum one-way latency of 75 ms. The network team is considering two designs: a direct dedicated link and a path through a public internet VPN. The direct link has a propagation delay of 70 ms, while the VPN path has a propagation delay of 60 ms but experiences variable congestion. Which design is more appropriate?

   • AUse the direct dedicated link because it provides consistent low latency and avoids congestion.
   • BUse the VPN path because it has lower propagation delay.
   • CUse the VPN path and rely on QoS to mitigate congestion.
   • DUse both links and load-balance the traffic.
   Reveal Solution Discussion Select an answer first
6. 45expert · hard

   A company runs a unified communications system that includes VoIP, video conferencing, and a critical database application. The WAN link is 100 Mbps. The network team must configure QoS to ensure all applications perform well. The database application is sensitive to packet loss, while VoIP and video are sensitive to latency and jitter. Which QoS policy is most balanced?

   • AUse WRED on all queues to avoid congestion.
   • BGive all traffic equal priority using FIFO queuing.
   • CGive VoIP and video strict priority, and place database traffic in a low-latency queue with guaranteed bandwidth.
   • DGive the database strict priority and place VoIP and video in a best-effort queue.
   Reveal Solution Discussion Select an answer first