1.2. Differentiate Between Bandwidth and Throughput. 100-150 Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A network administrator is troubleshooting a slow backup over a satellite link. The link has 50 Mbps bandwidth and 600 ms RTT. An Iperf test shows only 5 Mbps throughput. The administrator suspects the issue is TCP window size. Which solution would most effectively improve throughput?

   • AIncrease the RTT by adding a delay device
   • BUse UDP for the backup instead of TCP
   • CIncrease the TCP window size on the hosts
   • DReduce the bandwidth of the link to 10 Mbps
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A user runs an internet speed test and sees a download speed of 100 Mbps, but when downloading a large file from a corporate server, the transfer rate is only 20 Mbps. The user's internet plan is 200 Mbps. Which factor is most likely responsible for the difference?

   • AThe user's computer has a virus that slows down all downloads
   • BThe user's internet bandwidth is actually 20 Mbps
   • CThe speed test measured upload speed instead of download speed
   • DThe corporate server's upload bandwidth or its own network limitations
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A user runs a speed test and gets 250 Mbps download and 10 Mbps upload. The user's plan is 300 Mbps symmetric. The user complains that video calls are choppy. What is the most likely cause?

   • AThe bandwidth is 250 Mbps down and 10 Mbps up, so the plan is not symmetric.
   • BThe download throughput is too low for video calls.
   • CThe latency is high because the speed test shows a large difference between download and upload speeds.
   • DThe upload throughput is much lower than the plan's bandwidth, which can affect video call quality because upload is used for sending video.
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A company operates a real-time trading application that requires both low latency and high throughput. The network team is evaluating two WAN providers: Provider X offers 100 ms RTT with 1 Gbps bandwidth, and Provider Y offers 20 ms RTT with 100 Mbps bandwidth. The application sends small messages but also performs periodic large data transfers. Which provider is the better choice?

   • AProvider X, because bandwidth is more important than latency for all applications
   • BProvider Y, because the low latency is critical for real-time trading, and the 100 Mbps bandwidth is sufficient for the data transfers
   • CProvider Y, because lower latency always means higher throughput
   • DProvider X, because the higher bandwidth ensures the large data transfers complete quickly
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   A company is comparing two internet connections for a branch office. Connection A has 200 Mbps bandwidth and 40 ms latency. Connection B has 100 Mbps bandwidth and 5 ms latency. The office primarily uses a cloud-based ERP system that involves many small, interactive requests. Which connection will likely provide a better user experience, and why?

   • AConnection A, because higher bandwidth also reduces latency.
   • BBoth will provide the same user experience because the total data transferred is small.
   • CConnection B, because lower latency reduces the delay for each interactive request, which is more important than raw bandwidth for this workload.
   • DConnection A, because higher bandwidth allows more data to be transferred per second, which is the main factor for any cloud application.
   Reveal Solution Discussion Select an answer first