Back-End Development Development 2

Question 1

Which HTTP status code should an API return when a requested resource is not found?

Accepted Answer

404 Not Found

Answer

404 Not Found indicates the server could not locate the requested resource.

Question 2

In RESTful API design, which HTTP method is idempotent AND safe?

Accepted Answer

GET

Answer

GET is both idempotent (multiple identical requests produce the same result) and safe (it does not modify server state).

Question 3

What does the CAP theorem state about distributed systems?

Accepted Answer

Consistency, Availability, and Partition tolerance cannot all be guaranteed simultaneously

Answer

CAP theorem states a distributed system can guarantee at most two of the three properties: Consistency, Availability, and Partition tolerance.

Question 4

Which pattern separates the construction of a complex object from its representation?

Accepted Answer

Builder

Answer

The Builder pattern allows step-by-step construction of complex objects while keeping the construction process independent of the final representation.

Question 5

What is the primary purpose of database connection pooling in back-end applications?

Accepted Answer

To reuse existing database connections and reduce overhead

Answer

Connection pooling maintains a cache of reusable database connections, reducing the cost of repeatedly opening and closing connections.

Back-End Development Practice Test

Back-End Development Practice Test

Back-End Development Development 2