9. Explain the Impacts of Network Constraints on Applications 200-901 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A company runs a video conferencing service that requires low jitter and low packet loss. The network also carries bulk file transfers that are not time-sensitive. The network team wants to ensure the video conferencing quality even during peak usage. What should they configure?

   • AEnable DiffServ marking on the video traffic and apply a priority queue.
   • BIncrease the MTU on all routers to reduce packet count.
   • CUse a VPN for all traffic to encrypt and protect it.
   • DDisable TCP window scaling on the file transfer traffic.
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A company is designing a network for a new office. The office will have 100 employees who use a mix of VoIP, web browsing, and large file transfers. The WAN link is 200 Mbps. The network team must ensure that VoIP quality is maintained even during peak usage. Which design choice is most effective?

   • AIncrease the WAN link to 500 Mbps to avoid congestion.
   • BUse a separate VLAN for VoIP and connect it to the WAN router with a dedicated link.
   • CDisable file transfers during peak hours.
   • DImplement QoS with strict priority for VoIP and rate-limit file transfers to a maximum of 50 Mbps.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A financial trading firm uses a TCP-based application to transmit real-time market data between two data centers. The application is sensitive to latency and throughput. The network team notices that the TCP retransmission rate is high, and the application's throughput is lower than expected. What is the most likely cause?

   • AThe application is using UDP, which does not guarantee delivery.
   • BThe routers are configured with QoS that drops all TCP traffic.
   • CThe WAN link is underutilized, causing TCP to increase its window size.
   • DPacket loss on the WAN link is triggering TCP congestion control and reducing the window size.
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A company runs a database replication application between two data centers over a WAN. The application uses TCP and requires high throughput. The network has a round-trip time (RTT) of 50 ms and a packet loss rate of 1%. The throughput is much lower than expected. The team is considering two solutions: (A) increase the TCP window size, or (B) reduce packet loss by upgrading the WAN link. Which solution is more likely to improve throughput?

   • AReduce packet loss by upgrading the WAN link.
   • BIncrease the TCP window size to allow more data in flight.
   • CNeither solution will improve throughput because the RTT is too high.
   • DBoth solutions will have the same effect on throughput.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   A network administrator notices that a UDP-based streaming application is experiencing glitches and missing data. The network has occasional packet loss. Why does packet loss cause noticeable problems for this UDP application?

   • AUDP requires all packets to arrive in order
   • BUDP retransmits lost packets, causing delays
   • CUDP does not retransmit lost packets, so data is permanently lost
   • DUDP uses a congestion window that shrinks on loss
   Reveal Solution Discussion Select an answer first