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試験は、EC2、S3、RDS、VPC、IAMなどのAWSサービスに関する候補者の知識をテストします。また、AWS上で高可用性で費用効果の高いスケーラブルなシステムを設計・展開する能力も評価されます。試験は65問の複数選択肢・複数回答問題で構成され、所要時間は130分です。

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Amazon AWS Certified Solutions Architect - Associate (SAA-C03) Exam 認定 SAA-C03 試験問題 (Q28-Q33):

質問 # 28
A company is migrating a distributed application to AWS The application serves variable workloads The legacy platform consists of a primary server trial coordinates jobs across multiple compute nodes The company wants to modernize the application with a solution that maximizes resiliency and scalability.
How should a solutions architect design the architecture to meet these requirements?

A. Configure an Amazon Simple Queue Service (Amazon SQS) queue as a destination for the jobs Implement the compute nodes with Amazon EC2 instances that are managed in an Auto Scaling group.
Configure EC2 Auto Scaling to use scheduled scaling
B. Configure an Amazon Simple Queue Service (Amazon SQS) queue as a destination for the jobs Implement the compute nodes with Amazon EC2 Instances that are managed in an Auto Scaling group Configure EC2 Auto Scaling based on the size of the queue
C. implement the primary server and the compute nodes with Amazon EC2 instances that are managed in an Auto Scaling group Configure Amazon EventBridge (Amazon CloudWatch Events) as a destination for the jobs Configure EC2 Auto Scaling based on the load on the compute nodes
D. Implement the primary server and the compute nodes with Amazon EC2 instances that are managed In an Auto Scaling group. Configure AWS CloudTrail as a destination for the fobs Configure EC2 Auto Scaling based on the load on the primary server

正解：B

解説：
Explanation
To maximize resiliency and scalability, the best solution is to use an Amazon SQS queue as a destination for the jobs. This decouples the primary server from the compute nodes, allowing them to scale independently.
This also helps to prevent job loss in the event of a failure. Using an Auto Scaling group of Amazon EC2 instances for the compute nodes allows for automatic scaling based on the workload. In this case, it's recommended to configure the Auto Scaling group based on the size of the Amazon SQS queue, which is a better indicator of the actual workload than the load on the primary server or compute nodes. This approach ensures that the application can handle variable workloads, while also minimizing costs by automatically scaling up or down the compute nodes as needed.

質問 # 29
A company is creating a prototype of an ecommerce website on AWS. The website consists of an Application Load Balancer, an Auto Scaling group of Amazon EC2 instances for web servers, and an Amazon RDS for MySQL DB instance that runs with the Single-AZ configuration.
The website is slow to respond during searches of the product catalog. The product catalog is a group of tables in the MySQL database that the company does not ate frequently. A solutions architect has determined that the CPU utilization on the DB instance is high when product catalog searches occur.
What should the solutions architect recommend to improve the performance of the website during searches of the product catalog?

A. Implement an Amazon ElastiCache for Redis cluster to cache the product catalog. Use lazy loading to populate the cache.
B. Migrate the product catalog to an Amazon Redshift database. Use the COPY command to load the product catalog tables.
C. Add an additional scaling policy to the Auto Scaling group to launch additional EC2 instances when database response is slow.
D. Turn on the Multi-AZ configuration for the DB instance. Configure the EC2 instances to throttle the product catalog queries that are sent to the database.

正解：A

解説：
Requirement Analysis: The product catalog search is causing high CPU utilization on the MySQL DB instance, slowing down the website.
ElastiCache Overview: Amazon ElastiCache for Redis can be used to cache frequently accessed data, reducing load on the database.
Lazy Loading: This caching strategy loads data into the cache only when it is requested, improving response times for repeated queries.
Implementation:
Set up an ElastiCache for Redis cluster.
Modify the application to check the cache before querying the database.
Use lazy loading to populate the cache on cache misses.
Conclusion: This approach reduces database load and improves website performance during product catalog searches.
Reference
Amazon ElastiCache: ElastiCache Documentation
Caching Strategies: ElastiCache Caching Strategies

質問 # 30
An Amazon EC2 administrator created the following policy associated with an IAM group containing several users

What is the effect of this policy?

A. Users can terminate an EC2 instance with the IP address 10 100 100 1 in the us-east-1 Region
B. Users can terminate an EC2 instance in the us-east-1 Region when the user's source IP is
10.100.100.254.
C. Users can terminate an EC2 instance in any AWS Region except us-east-1.
D. Users cannot terminate an EC2 instance in the us-east-1 Region when the user's source IP is 10.100 100
254

正解：B

解説：
as the policy prevents anyone from doing any EC2 action on any region except us-east-1 and allows only users with source ip 10.100.100.0/24 to terminate instances. So user with source ip 10.100.100.254 can terminate instances in us-east-1 region.

質問 # 31
A solutions architect is instructed to host a website that consists of HTML, CSS, and some Javascript files. The web pages will display several high-resolution images. The website should have optimal loading times and be able to respond to high request rates.
Which of the following architectures can provide the most cost-effective and fastest loading experience?

A. Launch an Auto Scaling Group using an AMI that has a pre-configured Apache web server, then configure the scaling policy accordingly. Store the images in an Elastic Block Store. Then, point your instance's endpoint to AWS Global Accelerator.
B. Upload the HTML, CSS, Javascript, and the images in a single bucket. Then enable website hosting.
Create a CloudFront distribution and point the domain on the S3 website endpoint.
C. Host the website using an Nginx server in an EC2 instance. Upload the images in an S3 bucket. Use CloudFront as a CDN to deliver the images closer to end-users.
D. Host the website in an AWS Elastic Beanstalk environment. Upload the images in an S3 bucket. Use CloudFront as a CDN to deliver the images closer to your end-users.

正解：B

解説：
Amazon S3 is an object storage service that offers industry-leading scalability, data availability, security, and performance. Additionally, You can use Amazon S3 to host a static website. On a static website, individual webpages include static content. Amazon S3 is highly scalable and you only pay for what you use, you can start small and grow your application as you wish, with no compromise on performance or reliability.
Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds. CloudFront can be integrated with Amazon S3 for fast delivery of data originating from an S3 bucket to your end-users. By design, delivering data out of CloudFront can be more cost-effective than delivering it from S3 directly to your users.

In the scenario, Since we are only dealing with static content, we can leverage the web hosting feature of S3. Then we can improve the architecture further by integrating it with CloudFront. This way, users will be able to load both the web pages and images faster than if we hosted them on a webserver that we built from scratch.
Hence, the correct answer is: Upload the HTML, CSS, Javascript, and the images in a single bucket.
Then enable website hosting. Create a CloudFront distribution and point the domain on the S3 website endpoint.
The option that says: Host the website using an Nginx server in an EC2 instance. Upload the images in an S3 bucket. Use CloudFront as a CDN to deliver the images closer to end-users is incorrect. Creating your own web server to host a static website in AWS is a costly solution. Web Servers on an EC2 instance are usually used for hosting applications that require server-side processing (connecting to a database, data validation, etc.). Since static websites contain web pages with fixed content, we should use S3 website hosting instead.
The option that says: Launch an Auto Scaling Group using an AMI that has a pre-configured Apache web server, then configure the scaling policy accordingly. Store the images in an Elastic Block Store. Then, point your instance's endpoint to AWS Global Accelerator is incorrect. This is how we serve static websites in the old days. Now, with the help of S3 website hosting, we can host our static contents from a durable, high-availability, and highly scalable environment without managing any servers. Hosting static websites in S3 is cheaper than hosting it in an EC2 instance. In addition, Using ASG for scaling instances that host a static website is an over-engineered solution that carries unnecessary costs. S3 automatically scales to high requests and you only pay for what you use.
The option that says: Host the website in an AWS Elastic Beanstalk environment. Upload the images in an S3 bucket. Use CloudFront as a CDN to deliver the images closer to your end-users is incorrect.
AWS Elastic Beanstalk simply sets up the infrastructure (EC2 instance, load balancer, auto-scaling group) for your application. It's a more expensive and a bit of an overkill solution for hosting a bunch of client-side files.
References:
https://docs.aws.amazon.com/AmazonS3/latest/dev/WebsiteHosting.html
https://aws.amazon.com/blogs/networking-and-content-delivery/amazon-s3-amazon-cloudfront-a-match- made-in-the-cloud/ Check out these Amazon S3 and CloudFront Cheat Sheets: https://tutorialsdojo.com/amazon-s3/
https://tutorialsdojo.com/amazon-cloudfront/

質問 # 32
A Solutions Architect is managing a three-tier web application that processes credit card payments and online transactions. Static web pages are used on the front-end tier while the application tier contains a single Amazon EC2 instance that handles long-running processes. The data is stored in a MySQL database. The Solutions Architect is instructed to decouple the tiers to create a highly available application.
Which of the following options can satisfy the given requirement?

A. Move all the static assets and web pages to Amazon CloudFront. Use Auto Scaling in Amazon EC2 instance. Migrate the database to Amazon RDS with Multi-AZ deployments configuration.
B. Move all the static assets and web pages to Amazon S3. Re-host the application to Amazon Elastic Container Service (Amazon ECS) containers and enable Service Auto Scaling. Migrate the database to Amazon RDS with Multi-AZ deployments configuration.
C. Move all the static assets, web pages, and the backend application to a larger instance. Use Auto Scaling in Amazon EC2 instance. Migrate the database to Amazon Aurora.
D. Move all the static assets to Amazon S3. Set concurrency limit in AWS Lambda to move the application to a serverless architecture. Migrate the database to Amazon DynamoDB.

正解：B

解説：
Amazon Elastic Container Service (ECS) is a highly scalable, high performance container management service that supports Docker containers and allows you to easily run applications on a managed cluster of Amazon EC2 instances. Amazon ECS makes it easy to use containers as a building block for your applications by eliminating the need for you to install, operate, and scale your own cluster management infrastructure. Amazon ECS lets you schedule long-running applications, services, and batch processes using Docker containers. Amazon ECS maintains application availability and allows you to scale your containers up or down to meet your application's capacity requirements.

The requirement in the scenario is to decouple the services to achieve a highly available architecture. To accomplish this requirement, you must move the existing set up to each AWS services. For static assets, you should use Amazon S3. You can use Amazon ECS for your web application and then migrate the database to Amazon RDS with Multi-AZ deployment. Decoupling your app with application integration services allows them to remain interoperable, but if one service has a failure or spike in workload, it won't affect the rest of them.
Hence, the correct answer is: Move all the static assets and web pages to Amazon S3. Re-host the application to Amazon Elastic Container Service (Amazon ECS) containers and enable Service Auto Scaling. Migrate the database to Amazon RDS with Multi-AZ deployments configuration.
The option that says: Move all the static assets to Amazon S3. Set concurrency limit in AWS Lambda to move the application to a serverless architecture. Migrate the database to Amazon DynamoDB is incorrect because Lambda functions can't process long-running processes. Take note that a Lambda function has a maximum processing time of 15 minutes.
The option that says: Move all the static assets, web pages, and the backend application to a larger instance. Use Auto Scaling in Amazon EC2 instance. Migrate the database to Amazon Aurora is incorrect because static assets are more suitable and cost-effective to be stored in S3 instead of storing them in an EC2 instance.
The option that says: Move all the static assets and web pages to Amazon CloudFront. Use Auto Scaling in Amazon EC2 instance. Migrate the database to Amazon RDS with Multi-AZ deployments configuration is incorrect because you can't store data in Amazon CloudFront. Technically, you only store cache data in CloudFront, but you can't host applications or web pages using this service. You have to use Amazon S3 to host the static web pages and use CloudFront as the CDN. References:
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-auto-scaling.html
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html Check out this Amazon ECS Cheat Sheet:
https://tutorialsdojo.com/amazon-elastic-container-service-amazon-ecs/

質問 # 33
......

IT認定試験は現在の社会で、特にIT業界で最も人気のある試験だと考えられています。IT認定試験の認証資格は国際社会で広く認可されています。昇進したく、昇給したく、あるいは単に自分の仕事スキルを向上させたいなら、IT認定試験を受験して資格を取得するのはあなたの最もよい選択です。どうですか。あなたもきっとそう思うでしょう。ですから、躊躇しないではやく試験を申し込みましょう。AmazonのSAA-C03認定試験は最近最も人気のある試験ですから、受験したいのですか。試験に準備する方法がわからない場合、Xhs1991は教えてあげます。Xhs1991で、あなたは試験に関するすべての優れた参考書を見つけることができます。

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