100-150 Question 22
Single answerA network administrator is troubleshooting a performance issue on a company's network. They have noticed high latency during file transfers between two remote sites. To analyze the problem, they run a speed test as well as an Iperf test. Which result from the Iperf test would BEST indicate a latency issue, and why?
- A
Low bandwidth and high jitter in the Iperf results
- B
High throughput with no packet loss in the Iperf results
- C
High round-trip time (RTT) and low bandwidth in the Iperf results
- D
Low latency and consistent throughput in the Iperf results
Show answer and explanation
Correct answer: C
Explanation
Iperf is a tool that measures network performance, including RTT, bandwidth, jitter, and packet loss. High latency is reflected in a high RTT, which means there is significant delay in the time it takes for data to travel across the network. In this scenario, high RTT combined with low bandwidth clearly points to a latency issue as the source of the problem.
- A. Incorrect.
Low bandwidth and high jitter could indicate network instability but do not specifically point to a latency issue. Jitter measures variation in packet delay, while latency focuses on the overall delay.
- B. Incorrect.
High throughput with no packet loss would indicate the network is performing well, making it unlikely that latency is the core issue.
- C. Correct.
High round-trip time (RTT) and low bandwidth are strong indicators of high latency affecting the network, as RTT directly measures the time it takes for packets to travel back and forth.
- D. Incorrect.
Low latency and consistent throughput indicate a healthy network, making this result inconsistent with the reported high latency issue.