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Amazon AWS Certified Solutions Architect - Professional (SAP-C02) 認定 SAP-C02 試験問題 (Q479-Q484):

質問 # 479
Accompany runs an application on Amazon EC2 and AWS Lambda. The application stores temporary data in Amazon S3. The S3 objects are deleted after 24 hours.
The company deploys new versions of the application by launching AWS CloudFormation stacks.
The stacks create the required resources. After validating a new version, the company deletes the old stack. The deletion of an old development stack recently failed. A solutions architect needs to resolve this issue without major architecture changes.
Which solution will meet these requirements?

A. Update the CloudFormation template to create an Amazon Elastic File System (Amazon EFS) file system to store temporary files instead of Amazon S3. Configure the Lambda functions to run in the same VPC as the EFS file system.
B. Modify the CloudFormation stack to attach a DeletionPolicy attribute with a value of Delete to the S3 bucket.
C. Create a Lambda function to delete objects from an S3 bucket. Add the Lambda function as a custom resource in the CloudFormation stack with a DependsOn attribute that points to the S3 bucket resource.
D. Update the CloudFormation stack to add a DeletionPolicy attribute with a value of Snapshot for the S3 bucket resource

正解：C

解説：
Using Lambda function as a custom resource ensures that the S3 bucket is emptied before the stack is deleted. DependsOn Attribute ensures the Lambda function runs and completes before attempting to delete the S3 bucket, thus preventing deletion failure.

質問 # 480
A company is deploying a distributed in-memory database on a fleet of Amazon EC2 instances. The fleet consists of a primary node and eight worker nodes. The primary node is responsible for monitoring cluster health, accepting user requests, distributing user requests to worker nodes and sending an aggregate response back to a client. Worker nodes communicate with each other to replicate data partitions.
The company requires the lowest possible networking latency to achieve maximum performance.
Which solution will meet these requirements?

A. Launch compute optimized EC2 instances in a spread placement group.
B. Launch memory optimized EC2 instances in a cluster placement group
C. Launch memory optimized EC2 instances in a partition placement group
D. Launch compute optimized EC2 instances in a partition placement group

正解：B

解説：
According to the AWS Certified Solutions Architect - Professional Official Amazon Text Book, a cluster placement group is a logical grouping of instances within a single Availability Zone. It is recommended for applications that need low network latency, high network throughput, or both. Network latency and throughput are improved because instances within the same placement group can communicate directly with each other over a high-speed, low-latency network connection. Memory-optimized instances are ideal for in-memory databases as they are optimized for high performance and low latency.

質問 # 481
A retail company is operating its ecommerce application on AWS. The application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The company uses an Amazon RDS DB instance as the database backend. Amazon CloudFront is configured with one origin that points to the ALB. Static content is cached. Amazon Route 53 is used to host all public zones.
After an update of the application, the ALB occasionally returns a 502 status code (Bad Gateway) error. The root cause is malformed HTTP headers that are returned to the ALB. The webpage returns successfully when a solutions architect reloads the webpage immediately after the error occurs.
While the company is working on the problem, the solutions architect needs to provide a custom error page instead of the standard ALB error page to visitors.
Which combination of steps will meet this requirement with the LEAST amount of operational overhead? (Choose two.)

A. Create an Amazon S3 bucket. Configure the S3 bucket to host a static webpage. Upload the custom error pages to Amazon S3.
B. Create an Amazon CloudWatch alarm to invoke an AWS Lambda function if the ALB health check response Target.FailedHealthChecks is greater than 0. Configure the Lambda function to modify the forwarding rule at the ALB to point to a publicly accessible web server.
C. Modify the existing Amazon Route 53 records by adding health checks. Configure a fallback target if the health check fails. Modify DNS records to point to a publicly accessible webpage.
D. Create an Amazon CloudWatch alarm to invoke an AWS Lambda function if the ALB health check response Elb.InternalError is greater than 0. Configure the Lambda function to modify the forwarding rule at the ALB to point to a public accessible web server.
E. Add a custom error response by configuring a CloudFront custom error page. Modify DNS records to point to a publicly accessible web page.

正解：A、E

解説：
"Save your custom error pages in a location that is accessible to CloudFront. We recommend that you store them in an Amazon S3 bucket, and that you don't store them in the same place as the rest of your website or application's content. If you store the custom error pages on the same origin as your website or application, and the origin starts to return 5xx errors, CloudFront can't get the custom error pages because the origin server is unavailable." https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/GeneratingCustomErrorResponses.html

質問 # 482
A company is creating a REST API to share information with six of its partners based in the United States. The company has created an Amazon API Gateway Regional endpoint. Each of the six partners will access the API once per day to post daily sales figures.
After initial deployment, the company observes 1.000 requests per second originating from 500 different IP addresses around the world. The company believes this traffic is originating from a botnet and wants to secure its API while minimizing cost.
Which approach should the company take to secure its API?

A. Create an AWS WAF web ACL with a rule to allow access to the IP addresses used by the six partners. Associate the web ACL with the API. Create a resource policy with a request limit and associate it with the API. Configure the API to require an API key on the POST method.
B. Create an Amazon CloudFront distribution with the API as the origin. Create an AWS WAF web ACL with a rule to block clients "hat submit more than five requests per day. Associate the web ACL with the CloudFront distribution. Configure CloudFront with an origin access identity (OAI) and associate it with the distribution. Configure API Gateway to ensure only the OAI can execute the POST method.
C. Create an Amazon CloudFront distribution with the API as the origin. Create an AWS WAF web ACL with a rule to block clients that submit more than five requests per day. Associate the web ACL with the CloudFront distribution. Add a custom header to the CloudFront distribution populated with an API key. Configure the API to require an API key on the POST method.
D. Associate the web ACL with the API. Create a usage plan with a request limit and associate it with the API. Create an API key and add it to the usage plan.

正解：D

解説：
"A usage plan specifies who can access one or more deployed API stages and methods-and also how much and how fast they can access them. The plan uses API keys to identify API clients and meters access to the associated API stages for each key. It also lets you configure throttling limits and quota limits that are enforced on individual client API keys." https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-usage-plans.html

質問 # 483
A company provides a software as a service (SaaS) application that runs in the AWS Cloud. The application runs on Amazon EC2 instances behind a Network Load Balancer (NLB). The instances are in an Auto Scaling group and are distributed across three Availability Zones in a single AWS Region.
The company is deploying the application into additional Regions. The company must provide static IP addresses for the application to customers so that the customers can add the IP addresses to allow lists.
The solution must automatically route customers to the Region that is geographically closest to them.
Which solution will meet these requirements?

A. Create an AWS Global Accelerator standard accelerator. Create a standard accelerator endpoint for the NLB in each additional Region. Provide customers with the Global Accelerator IP address.
B. Create an Amazon CloudFront distribution. Create a custom origin for the NLB in each additional Region. Provide customers with the IP address ranges of the distribution's edge locations.
C. Create an Amazon CloudFront distribution. Create a CloudFront origin group. Add the NLB for each additional Region to the origin group. Provide customers with the IP address ranges of the distribution's edge locations.
D. Create an AWS Global Accelerator custom routing accelerator. Create a listener for the custom routing accelerator. Add the IP address and ports for the NLB in each additional Region. Provide customers with the Global Accelerator IP address.

正解：A

解説：
Explanation: AWS Global Accelerator is a networking service that helps you improve the availability and performance of the applications that you offer to your global users1. It provides static IP addresses that act as a fixed entry point to your applications and route user traffic to the optimal endpoint based on performance, health, and policies that you configure1. By creating a standard accelerator endpoint for the NLB in each additional Region, you can ensure that customers are automatically directed to the Region that is geographically closest to them2. You can also provide customers with the Global Accelerator IP address, which is anycast from AWS edge locations and does not change when you add or remove endpoints3.
:
What is AWS Global Accelerator?
Standard accelerator endpoints
AWS Global Accelerator IP addresses

質問 # 484
......

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