API API Performance Testing

Question 1

Which tool is most commonly used for API load and performance testing?

Accepted Answer

JMeter

Answer

Postman

Answer

Swagger

Answer

Insomnia

Question 2

What is the goal of load testing an API?

Accepted Answer

Evaluate API behavior under expected peak traffic

Answer

Find security vulnerabilities

Answer

Validate JSON schema

Answer

Test authentication flows

Question 3

What does 'throughput' measure in API performance testing?

Accepted Answer

Number of requests processed per unit of time

Answer

Average response size

Answer

Error rate percentage

Answer

Memory usage on the server

Question 4

What type of performance test pushes the API beyond its capacity to find the breaking point?

Accepted Answer

Stress test

Answer

Load test

Answer

Smoke test

Answer

Soak test

Question 5

What is a 'soak test' (endurance test) in API performance testing?

Accepted Answer

A test that runs at normal load for an extended period to detect memory leaks

Answer

A test with extremely high traffic spikes

Answer

A test that checks API responses for correctness

Answer

A test with zero load to measure baseline

Question 6

What does P99 latency mean in API performance metrics?

Accepted Answer

The response time at which 99% of requests complete faster

Answer

The average response time

Answer

The maximum response time recorded

Answer

The error rate at 99% load