During a load test, the monitoring tool shows that the application server's CPU is at 95% and the disk I/O is at 10%. The response time is increasing. Which metric from the monitoring tool would best confirm that CPU saturation is the cause?

The network bytes received per second

A performance test on a web application shows that the server-side response time is 1 second, but the client-side page load time is 6 seconds. The network latency is 20 ms. Which source of metrics is most likely to reveal the cause of the discrepancy?

Browser developer tools or client-side performance metrics

Infrastructure monitoring tool for CPU usage

An infrastructure monitoring tool reports that a server's disk utilization is at 95%. What does this metric indicate?

The network bandwidth is saturated

The disk is almost full or heavily used

The application has a memory leak

A load testing tool reports a throughput of 200 requests per second and an average response time of 2 seconds. The test engineer wants to understand if the throughput is limited by the server or the test design. Which additional metric from the load testing tool would be most useful?

The number of concurrent virtual users and the think time between requests

The version of the load testing tool

The IP address of the load generator

Certified Tester Performance Testing

Domain 2Objective 5

Key Sources of Performance Metrics CT-PT Practice Questions (Page 6)

Part of the Performance Measurement Fundamentals domain, which makes up ~28% of our current practice bank. ISTQB does not publish an official question count, but from its 90-minute exam (~35–60 total, ~10–17 in this domain), expect 2–3 from this objective — we provide 30 practice questions to prepare you well beyond it. (estimate)

30questions here

6free pages

6concepts

Questions 26–30

26application · medium
During a load test, the monitoring tool shows that the application server's CPU is at 95% and the disk I/O is at 10%. The response time is increasing. Which metric from the monitoring tool would best confirm that CPU saturation is the cause?
Select an answer first
27application · medium
A performance test on a web application shows that the server-side response time is 1 second, but the client-side page load time is 6 seconds. The network latency is 20 ms. Which source of metrics is most likely to reveal the cause of the discrepancy?
Select an answer first
28foundation · easy
A performance test engineer needs to collect metrics during a load test. Which of the following is a primary source from which performance metrics can be collected?
Select an answer first
29foundation · easy
An infrastructure monitoring tool reports that a server's disk utilization is at 95%. What does this metric indicate?
Select an answer first
30application · medium
A load testing tool reports a throughput of 200 requests per second and an average response time of 2 seconds. The test engineer wants to understand if the throughput is limited by the server or the test design. Which additional metric from the load testing tool would be most useful?
Select an answer first

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