Table of Contents
Question
A software-as-a-service (SaaS) provider exposes APIs through an Application Load Balancer (ALB). The ALB connects to an Amazon Elastic Kubernetes Service (Amazon EKS) cluster that is deployed in the us-east-1 Region. The exposed APIs contain usage of a few non-standard REST methods: LINK, UNLINK, LOCK, and UNLOCK.
Users outside the United States are reporting long and inconsistent response times for these APIs. A solutions architect needs to resolve this problem with a solution that minimizes operational overhead. Which solution meets these requirements?
A. Add an Amazon CloudFront distribution. Configure the ALB as the origin.
B. Add an Amazon API Gateway edge-optimized API endpoint to expose the APIs. Configure the ALB as the target.
C. Add an accelerator in AWS Global Accelerator. Configure the ALB as the origin.
D. Deploy the APIs to two additional AWS Regions: eu-west-1 and ap-southeast-2. Add latency-based routing records in Amazon Route 53.
Answer
C. Add an accelerator in AWS Global Accelerator. Configure the ALB as the origin.
Explanation
Based on the options given, I think the most likely answer to your question is C. Add an accelerator in AWS Global Accelerator. Configure the ALB as the origin. This is because AWS Global Accelerator can improve the performance of your APIs by up to 60% by routing user traffic over the AWS global network to the optimal regional endpoint based on health, client location, and policies that you configure. You can add an accelerator in AWS Global Accelerator and configure the ALB as the origin for your APIs. This way, users outside the United States can access your APIs through the static IP addresses provided by AWS Global Accelerator, which act as a fixed entry point to your ALB. This solution meets the requirements of resolving the long and inconsistent response times for your APIs and minimizing operational overhead.
The other statements are less likely because:
A. Add an Amazon CloudFront distribution. Configure the ALB as the origin.
This statement is less likely because Amazon CloudFront is a content delivery network (CDN) service that speeds up delivery of your static and dynamic web content by caching it at edge locations closer to your users. However, CloudFront does not support non-standard REST methods such as LINK, UNLINK, LOCK, and UNLOCK. Therefore, this solution would not work for your APIs that use these methods.
B. Add an Amazon API Gateway edge-optimized API endpoint to expose the APIs. Configure the ALB as the target.
This statement is less likely because Amazon API Gateway is a service that lets you create, publish, maintain, monitor, and secure APIs at any scale. An edge-optimized API endpoint is a type of API endpoint that uses CloudFront to improve performance for global clients by caching responses from your API at edge locations. However, as mentioned above, CloudFront does not support non-standard REST methods such as LINK, UNLINK, LOCK, and UNLOCK. Therefore, this solution would not work for your APIs that use these methods.
D. Deploy the APIs to two additional AWS Regions: eu-west-1 and ap-southeast-2. Add latency-based routing records in Amazon Route 53.
This statement is less likely because deploying the APIs to two additional AWS Regions would incur additional costs for running more EC2 instances and EKS clusters in different Regions. Also, adding latency-based routing records in Amazon Route 53 would require more manual steps and configuration than using AWS Global Accelerator. Moreover, latency-based routing records are based on historical data rather than real-time measurements of network conditions. Therefore, this solution would not be as effective or efficient as using AWS Global Accelerator.
Reference
- Expose Amazon EKS pods through cross-account load balancer | Containers
- Application load balancing on Amazon EKS – Amazon EKS
- Network Acceleration Service – AWS Global Accelerator – AWS (amazon.com)
- Troubleshoot performance degradation – Azure App Service | Microsoft Learn
- amazon web services – API Gateway + Lambda extremely slower response time – Stack Overflow
- Creating low-latency, high-volume APIs with Provisioned Concurrency | AWS Compute Blog (amazon.com)
- AWS Global Accelerator FAQs – Amazon Web Services
- What is AWS Global Accelerator? – AWS Global Accelerator (amazon.com)
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