A performance test of a file upload feature shows that the throughput (requests per second) plateaus at 50 RPS even when the load is increased to 200 concurrent users. The application server CPU is at 80%, and the network bandwidth is at 30%. What is the most likely bottleneck?

Application server CPU saturation

Database connection pool exhaustion

Certified Tester Advanced Level Technical Test Analyst

Domain 6Objective 5

Performance Testing Tools CTAL-TTA Practice Questions (Page 7)

Part of the Domain 6: Test Tools and Automation domain, which makes up ~25% of our current practice bank. ISTQB does not publish an official question count, but from its 120-minute exam (~50–80 total, ~13–20 in this domain), expect 1–2 from this objective — we provide 31 practice questions to prepare you well beyond it. (estimate)

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Questions 31–31

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A performance test of a file upload feature shows that the throughput (requests per second) plateaus at 50 RPS even when the load is increased to 200 concurrent users. The application server CPU is at 80%, and the network bandwidth is at 30%. What is the most likely bottleneck?
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Performance Testing Tools CTAL-TTA Practice Questions (Page 7)

Questions 31–31

A performance test of a file upload feature shows that the throughput (requests per second) plateaus at 50 RPS even when the load is increased to 200 concurrent users. The application server CPU is at 80%, and the network bandwidth is at 30%. What is the most likely bottleneck?

Keep studying — Domain 6: Test Tools and Automation