An API allows different software systems to communicate by exposing specific functionalities.

• True

• False

Answer explanation

APIs define how different applications interact by sending and receiving requests and responses.

API testing focuses only on functional correctness and does not include security or performance checks.

• True

• False

Answer explanation

API testing covers various aspects, including functionality, security, performance, and reliability.

RESTful APIs are the least commonly used architecture in modern software development.

• True

• False

Answer explanation

REST APIs are the most commonly used due to their simplicity and scalability.

In API testing, a response time of 10 seconds is generally considered optimal for user experience.

• True

• False

Answer explanation

API response times should be as low as possible, typically within milliseconds to ensure efficiency.

API versioning helps ensure that existing clients continue to work even after new updates.

• True

• False

Answer explanation

Versioning prevents breaking changes and allows older clients to function with previous API versions.

One challenge of API testing is dealing with unknown dependencies that may impact API functionality.

• True

• False

Answer explanation

APIs often rely on external services, which can affect availability, performance, and response consistency.

API regression testing is unnecessary if unit testing is performed correctly.

• True

• False

Answer explanation

Unit testing focuses on individual components, while regression testing ensures that new changes do not break existing functionalities.

Which of the following describes the primary function of an API?

• Displaying user interfaces

• Connecting software applications

• Managing databases

• Automating test execution

Answer explanation

APIs allow software systems to communicate by sending and receiving structured data, enabling integration between applications.

Which testing type helps identify how an API performs under a sudden increase in traffic?

• Functional testing

• Spike testing

• Usability testing

• Unit testing

Answer explanation

Spike testing evaluates API performance when there is a sharp increase in traffic, helping ensure stability under peak loads.

Which is NOT a common challenge in API testing?

• Lack of standardization

• Managing dependencies

• Excessive graphical elements

• Performance bottlenecks

Answer explanation

APIs do not rely on graphical elements, as they function in the backend. API testing focuses on structure, performance, and security