API API Performance Testing 3

Question 1

What is the difference between latency and response time in API performance testing?

Accepted Answer

Latency is network delay; response time includes processing and latency

Answer

Latency refers to the network travel time, while response time is the total duration from request send to response receipt, including server processing.

Question 2

Which technique helps improve API performance by storing frequently requested responses temporarily?

Accepted Answer

Caching

Answer

Caching stores responses for identical requests, reducing backend processing and database load, significantly improving API throughput.

Question 3

What does a 'baseline test' establish in API performance testing?

Accepted Answer

Normal performance metrics used as a reference for future comparisons

Answer

A baseline test captures API performance under normal conditions, providing reference metrics to detect regressions after code changes.

Question 4

What HTTP mechanism allows a client to reuse an existing TCP connection for multiple requests, improving performance?

Accepted Answer

Keep-Alive

Answer

HTTP Keep-Alive (persistent connections) allows the client and server to reuse the same TCP connection for multiple requests, reducing connection overhead.

Question 5

Which API design technique reduces over-fetching and can improve performance by letting clients request only the data they need?

Accepted Answer

GraphQL queries

Answer

GraphQL lets clients specify exactly which fields they need, eliminating over-fetching and reducing response payload size.

API - Testing Practice Test

API - Testing Practice Test

API API Performance Testing 3