ISTQB Certified Tester - Performance Testing CT-PT Exam Questions

Answer : B

REST (Representational State Transfer) is a widely used web service protocol that enables client-server communication over HTTP. It is commonly used in modern APIs and web applications for performance testing.

Option A (SOAK) refers to soak testing, which evaluates performance over an extended period.

Option C (HTTP) is a transport protocol, but REST is the actual web service architecture built on HTTP.

Option D (RTE) is not a web service protocol but may refer to Real-Time Enterprise systems.

Answer : C

One of the most critical test acceptance criteria in performance testing is to ensure that the hardware in the test environment is comparable to production. Differences in CPU, memory, disk I/O, or network infrastructure can distort performance results.

Option A (Convincing stakeholders to set goals) is a planning activity, not an acceptance criterion.

Option B (Describing the system under test) is important but does not directly affect test acceptance.

Option D (Comparing baselined metrics) is useful, but without a comparable test environment, baseline metrics may be misleading.

Answer : D

Nested transactions allow performance tests to capture both individual and aggregated elements by grouping multiple related transactions and measuring their cumulative impact.

Option A (Aggregated metrics) provides summaries but lacks insight into individual elements.

Option B (Process optimization tracking) focuses on business process improvement, not test metrics.

Option C (Measuring underlying transactions) focuses only on individual transactions.

Answer : B

When system resources are oversaturated (e.g., CPU, RAM, or network bandwidth), response times will degrade because the system struggles to process requests efficiently. This is a key performance bottleneck indicator.

Option A is incorrect because response times do not improve under heavy load; they typically worsen.

Option C is incorrect because error logging may actually increase rather than decrease under stress.

Option D is incorrect because database size is independent of system saturation unless records are actively purged.

Answer : C

A key risk in distributed systems is unreliable remote servers, which can lead to latency, timeouts, and failures in performance testing.

Option A (Hard disk de-fragmentation) is not a significant risk in distributed systems.

Option B (Excess memory) is a positive factor, not a risk.

Option D (Bluetooth connectivity) is unrelated to distributed system performance.

Answer : A

Before running the next set of performance tests, it is crucial to understand the differences (delta) between the previous test results and the expected improvements. This ensures that:

The changes made by developers are properly validated.

Performance objectives are aligned with measurable improvements.

Option B (Adjust stakeholder expectations) is incorrect, as performance testing should focus on real data rather than adjusting expectations.

Option C and D (Realign objectives for milestones or time-to-market goals) are incorrect because test objectives should focus on technical accuracy rather than schedule constraints.

Answer : C

Aggregating test results helps stakeholders understand performance trends by combining data points from multiple test runs. This makes it easier to draw conclusions about system behavior.

Option A is incorrect because aggregation may reduce detailed visibility, not increase it.

Option B is incorrect because aggregation does not expedite testing itself.

Option D is incorrect because aggregated results do not indicate test completion.