A team is running a load test against a production system. The test is using a constant load of 500 users. Midway through the test, the team notices that the application's error rate has spiked, but the response times have not changed significantly. What is the most likely cause?

The application has hit a resource limit, such as a database connection pool or thread pool, causing requests to be rejected.

The network between the load generators and the application has become congested.

The load generators have run out of memory and are sending malformed requests.

The test script has a bug that only manifests under sustained load.

A team is using an open-source load generation tool to test a REST API. They need to simulate users who authenticate, perform a search, and then log out. What is the most efficient way to create this test?

Record the workflow using the tool's proxy and then parameterize the user credentials.

Use the tool's built-in 'search' function to generate the load automatically.

Use a single script that repeats the search step without authentication.

Manually write a script from scratch for each step of the workflow.

What is the primary purpose of load generation in performance testing?

To automate the execution of functional test cases to verify business logic

To simulate realistic user activity on the system under test and measure its behavior under expected or specified conditions

To monitor the system under test's hardware resources during the test

To generate test data for the system under test so that it has enough records to process

Why is the test environment important in load generation?

Because the environment's network and infrastructure can limit the amount of load that can be generated

Because the environment must be identical to the production environment for all tests

Because the environment is where the test results are stored

Because the environment determines the color scheme of the load testing tool

Certified Tester Performance Testing

Domain 1Objective 5

The Concept of Load Generation CT-PT Practice Questions (Page 5)

Part of the Basic Concepts domain, which makes up ~25% of our current practice bank. ISTQB does not publish an official question count, but from its 90-minute exam (~35–60 total, ~9–15 in this domain), expect 2–3 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

5concepts

Questions 21–25

21expert · hard
A team is running a load test against a production system. The test is using a constant load of 500 users. Midway through the test, the team notices that the application's error rate has spiked, but the response times have not changed significantly. What is the most likely cause?
Select an answer first
22application · medium
A team is using an open-source load generation tool to test a REST API. They need to simulate users who authenticate, perform a search, and then log out. What is the most efficient way to create this test?
Select an answer first
23application · medium
A team is testing an e-commerce site's ability to handle a flash sale where traffic is expected to jump from 200 to 5,000 users within 30 seconds. Which load generation type best models this scenario?
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24foundation · easy
What is the primary purpose of load generation in performance testing?
Select an answer first
25foundation · easy
Why is the test environment important in load generation?
Select an answer first

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