API Gateway Stages

5 minutes 5 Questions

API Gateway stages are a way to logically separate the development and deployment lifecycle of an API within API Gateway. Stages can represent different versions or environments of an API, such as development, testing, or production. With API Gateway stages, you can route traffic to specific instances of your API, create distinct configurations, and access fine-grained monitoring and logging options. Additionally, you can create and manage custom domain names, control access permissions, and utilize API Gateway features like caching, throttling, and logging in each stage.

Guide: Understanding Amazon API Gateway Stages

API Gateway Stages are an essential part of the Amazon API Gateway. They represent the path through which an API deployment is accessible. They are a pointer to a deployment of an API and they also provide features like throttling, caching, logging, and adding permissions.

Importance:
It becomes crucial in managing and handling versioning and lifecycle of an API. With stages, you can manage different environments (like dev, prod, test, etc.) for the API's lifecycle. Stages also have individual settings for throttling, caching, data tracing, and logging for observability and to control the usage of your APIs.

Working:
When you deploy an API, you need to provide a stage. Existing stages can also be updated with new deployments. Stages get a unique Invoke URL. Stages can also hold stage variables, which are name-value pairs, wherein you can store configuration settings that your setup needs to execute APIs.

Exam Tips:
Understanding the relationship between stages, deployments, and stage variables is key. Remember to consider caching and logging settings at the stage level. Be sure to recognize the usage scenarios where stages would be useful. Always remember that stages represent a named reference to a deployment.

Answering Questions on API Gateway Stages:
Know the purpose of API Gateway stages and understand the use cases (like versioning, environment separation). Be familiar with the configuration settings and features provided by API Gateway at the stage level (like throttling, caching, logging). Understanding how stage variables are used to manage configurations can be very beneficial.

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Question 1

An application requires monitoring for a particular stage in the API Gateway. Which AWS service can be used for monitoring the stage?

Amazon S3 AWS X-Ray Amazon CloudWatch AWS Config

Correct Answer: Amazon CloudWatch

Amazon CloudWatch provides monitoring for Amazon API Gateway resources such as stages. AWS X-Ray is for debugging and tracing, Amazon S3 is a storage service, AWS Config is for auditing and monitoring configuration changes, AWS CloudTrail is for auditing API calls, and AWS Trusted Advisor provides best practice insight.

Question 2

An API deployed with API Gateway is experiencing a high volume of traffic. How can the traffic be throttled to limit the requests per second?

Modify requester permissions Implement stage-level throttling Add additional request validations Enable asynchronous processing

Correct Answer: Implement stage-level throttling

To limit the number of requests per second, implement stage-level throttling in API Gateway. Implementing request validations, enabling asynchronous processing, modifying requester permissions, reducing Lambda concurrency, or using custom VPC endpoints do not address this requirement.

Question 3

A company is deploying a new API using API Gateway. For maintenance purposes, they need to handle traffic across multiple stages. Which Amazon API Gateway deployment process allows this capability?

Enable CORS for API Gateway Use Amazon CloudFront distributions for each stage Create stages with different names Use Lambda aliases with API Gateway

Correct Answer: Create stages with different names

Stages are used in Amazon API Gateway to manage different versions of an API. To handle traffic across multiple stages, create stages with different names to separate each version of the API. CORS, Lambda aliases, CloudFront distributions, and custom domain names do not provide the required staging functionality.

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