[cloudos]

QUESTION 128
A bank is re-architecting its mainframe-based credit card approval processing application to a cloudnative application on the AWS cloud. The new application will receive up to 1,000 requests per second at peak load. There are multiple steps to each transaction, and each step must receive the result of the previous step. The entire
request must return an authorization response within less than 2 seconds with zero data loss. Every
request must receive a response. The solution must be Payment Card Industry Data Security
Standard (PCI DSS)- compliant. Which option will meet all of the bank’s objectives with the LEAST complexity and LOWEST cost while also meeting compliance requirements?
A. Create an Amazon API Gateway to process inbound requests using a single AWS Lambda
task that performs multiple steps and returns a JSON object with the approval status. Open a support case to increase the limit for the number of concurrent Lambdas to allow room for bursts of activity due to the new application.
B. Create an Application Load Balancer with an Amazon ECS cluster on Amazon EC2 Dedicated
instances in a target group to process incoming requests. Use Auto Scaling to scale the cluster out/in based on average CPU utilization. Deploy a web service that processes all of the approval steps and returns a JSON object with the approval status.
C. Deploy the application on Amazon EC2 on Dedicated Instances. Use an Elastic Load
Balancer in front of a farm of application servers in an Auto Scaling group to handle incoming requests. Scale out/in based on a custom Amazon CloudWatch metric for the number of inbound requests per second after measuring the capacity of a single instance.
D. Create an Amazon API Gateway to process inbound requests using a series of AWS Lambda
processes, each with an Amazon SQS input queue. As each step completes, it writes its result to the next step’s queue. The final step returns a JSON object with the approval status. Open a support case to increase the limit for the number of concurrent Lambdas to allow room for bursts of activity due to the new application.

答案为C ？

[挨踢小茶]

D？这题很不确定啊。。

[叶威]

我选D;

zero data loss.

Every request must receive a response.

以上两个需要用到SQS,比A更合适

[thomas peng]

答案应该是A ，B 更complex, C 加ec2 配置起来麻烦，dedicated 也没必要，D 没有实效性

[ciscogeek]

支持A

[AmyXie]

A

[Bill.魏]

题目里面写的最大并发1000,其实就是暗示用lambda了。

[作者]

帖子