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      Question

      In cloud computing, what is the function of an API Gateway?

      A A physical device that connects cloud data centres to the public internet allowing users to connect to the required web application or internet services Correct Answer Incorrect Answer
      B A cloud storage service that manages API documentation and versioning allowing users to connect to different versions of the application Correct Answer Incorrect Answer
      C A managed service that acts as an entry point for APIs, handling authentication, rate limiting, routing, and monitoring of API requests Correct Answer Incorrect Answer
      D A tool for converting legacy application interfaces to cloud-native REST APIs automatically Correct Answer Incorrect Answer
      E A security tool that blocks all external API calls to cloud services Correct Answer Incorrect Answer

      Solution

      An API Gateway is a managed service that serves as the single entry point for all API calls to backend services. It handles Authentication and Authorisation (verifying API keys, OAuth tokens, JWT), Rate Limiting (preventing API abuse by limiting calls per second), Request Routing (directing calls to appropriate microservices), SSL Termination, Response Caching, Logging and Monitoring, and Protocol Translation. Examples include AWS API Gateway, Azure API Management, Kong, and Apigee. 

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