Understanding API Fundamentals

What is the primary purpose of an API?

• To enhance the performance of a single software system.

• To create user interfaces for applications.

• The primary purpose of an API is to enable communication between different software systems.

• To store data in a database.

Define what REST stands for in the context of APIs.

• Remote Execution State Transfer

• Resource State Transfer

• Representational Service Transfer

• Representational State Transfer

List three key principles of RESTful APIs.

• Client-server coupling

• Use of proprietary protocols

• Limited resource identification

• 1) Statelessness, 2) Resource-based architecture, 3) Use of standard media types.

What is the main difference between SOAP and REST APIs?

• SOAP is faster than REST.

• REST requires XML format; SOAP does not.

• SOAP is a protocol; REST is an architectural style.

• SOAP is more flexible than REST.

Explain how RESTful APIs handle state.

• Each request in RESTful APIs requires a session ID to track state.

• RESTful APIs use cookies to store client state information.

• RESTful APIs handle state by being stateless; each request contains all necessary information, and the server does not retain client context.

• RESTful APIs maintain client state on the server for efficiency.

What protocol is commonly used for RESTful APIs?

• SMTP

• HTTP

• FTP

• TCP

Describe a scenario where you would use a SOAP API instead of a REST API.

• Using a REST API for a simple web application with no security requirements.

• Using a SOAP API for a financial transaction system that requires high security and formal contracts.

• Choosing a SOAP API for a mobile app that needs quick responses.

• Implementing a REST API for a system that requires strict data validation.

What is a common format for data exchange in REST APIs?

• JSON

• XML

• CSV

• YAML

How do RESTful APIs achieve scalability?

• RESTful APIs achieve scalability by avoiding the use of standard HTTP methods.

• RESTful APIs achieve scalability by being stateless, enabling load balancing, utilizing caching, and employing standard HTTP methods.

• RESTful APIs achieve scalability by using a single server for all requests.

• RESTful APIs achieve scalability by maintaining session state on the server.

What are the advantages of using REST over SOAP?

• Advantages of using REST over SOAP include simplicity, lightweight nature, statelessness, support for multiple data formats, and easier integration with web services.

• REST requires more bandwidth than SOAP

• SOAP is easier to integrate with web services than REST

• REST supports only XML data format