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Amazon AWS Certified Solutions Architect – Associate (SAA-C03) Exam問題集を今すぐダウンロード

質問 43
A game company has a requirement of load balancing the incoming TCP traffic at the transport level (Layer 4) to their containerized gaming servers hosted in AWS Fargate. To maintain performance, it should handle millions of requests per second sent by gamers around the globe while maintaining ultra- low latencies.
Which of the following must be implemented in the current architecture to satisfy the new requirement?

  • A. Create a new record in Amazon Route 53 with Weighted Routing policy to load balance the incoming traffic.
  • B. Launch a new microservice in AWS Fargate that acts as a load balancer since using an ALB or NLB with Fargate is not possible.
  • C. Launch a new Network Load Balancer.
  • D. Launch a new Application Load Balancer.

正解: C

解説:
Elastic Load Balancing automatically distributes incoming application traffic across multiple targets, such as Amazon EC2 instances, containers, IP addresses, and Lambda functions. It can handle the varying load of your application traffic in a single Availability Zone or across multiple Availability Zones. Elastic Load Balancing offers three types of load balancers that all feature the high availability, automatic scaling, and robust security necessary to make your applications fault-tolerant. They are: Application Load Balancer, Network Load Balancer, and Classic Load Balancer Network Load Balancer is best suited for load balancing of TCP traffic where extreme performance is required. Operating at the connection level (Layer 4), Network Load Balancer routes traffic to targets within Amazon Virtual Private Cloud (Amazon VPC) and is capable of handling millions of requests per second while maintaining ultra-low latencies. Network Load Balancer is also optimized to handle sudden and volatile traffic patterns.

Hence, the correct answer is to launch a new Network Load Balancer.
The option that says: Launch a new Application Load Balancer is incorrect because it cannot handle TCP or Layer 4 connections, only Layer 7 (HTTP and HTTPS).
The option that says: Create a new record in Amazon Route 53 with Weighted Routing policy to load balance the incoming traffic is incorrect because although Route 53 can act as a load balancer by assigning each record a relative weight that corresponds to how much traffic you want to send to each resource, it is still not capable of handling millions of requests per second while maintaining ultra-low latencies. You have to use a Network Load Balancer instead.
The option that says: Launch a new microservice in AWS Fargate that acts as a load balancer since using an ALB or NLB with Fargate is not possible is incorrect because you can place an ALB and NLB in front of your AWS Fargate cluster.
References:
https://aws.amazon.com/elasticloadbalancing/features/#compare
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/load-balancer-types.html
https://aws.amazon.com/getting-started/projects/build-modern-app-fargate-lambda-dynamodb-python/m odule-two/ Check out this AWS Elastic Load Balancing (ELB) Cheat Sheet:
https://tutorialsdojo.com/aws-elastic-load-balancing-elb/

 

質問 44
A company uses Amazon S3 to store its confidential audit documents. The S3 bucket uses bucket policies to restrict access to audit team IAM user credentials according to the principle of least privilege. Company managers are worried about accidental deletion of documents in the S3 bucket and want a more secure solution.
What should a solutions architect do to secure the audit documents?

  • A. Enable the versioning and MFA Delete features on the S3 bucket.
  • B. Use AWS Key Management Service (AWS KMS) to encrypt the S3 bucket and restrict audit team IAM user accounts from accessing the KMS key.
  • C. Enable multi-factor authentication (MFA) on the IAM user credentials for each audit team IAM user account.
  • D. Add an S3 Lifecycle policy to the audit team’s IAM user accounts to deny the s3:DeleteObject action during audit dates.

正解: A

 

質問 45
A company is designing an application where users upload small files into Amazon S3. After a user uploads a file, the file requires one-time simple processing to transform the data and save the data in JSON format for later analysis.
Each file must be processed as quickly as possible after it is uploaded. Demand will vary. On some days, users will upload a high number of files. On other days, users will upload a few files or no files.
Which solution meets these requirements with the LEAST operational overhead?

  • A. Configure Amazon EMR to read text files from Amazon S3. Run processing scripts to transform the data. Store the resulting JSON file in an Amazon Aurora DB cluster.
  • B. Configure Amazon S3 to send an event notification to an Amazon Simple Queue Service (Amazon SQS) queue. Use an AWS Lambda function to read from the queue and process the data. Store the resulting JSON file in Amazon DynamoDB. Most Voted
  • C. Configure Amazon EventBridge (Amazon CloudWatch Events) to send an event to Amazon Kinesis Data Streams when a new file is uploaded. Use an AWS Lambda function to consume the event from the stream and process the data. Store the resulting JSON file in Amazon Aurora DB cluster.
  • D. Configure Amazon S3 to send an event notification to an Amazon Simple Queue Service (Amazon SQS) queue. Use Amazon EC2 instances to read from the queue and process the data. Store the resulting JSON file in Amazon DynamoDB.

正解: B

解説:
Amazon S3 sends event notifications about S3 buckets (for example, object created, object removed, or object restored) to an SNS topic in the same Region.
The SNS topic publishes the event to an SQS queue in the central Region.
The SQS queue is configured as the event source for your Lambda function and buffers the event messages for the Lambda function.
The Lambda function polls the SQS queue for messages and processes the Amazon S3 event notifications according to your application’s requirements.
https://docs.aws.amazon.com/prescriptive-guidance/latest/patterns/subscribe-a-lambda-function-to-event-notifications-from-s3-buckets-in-different-aws-regions.html

 

質問 46
A company plans to host a movie streaming app in AWS. The chief information officer (CIO) wants to ensure that the application is highly available and scalable. The application is deployed to an Auto Scaling group of EC2 instances on multiple AZs. A load balancer must be configured to distribute incoming requests evenly to all EC2 instances across multiple Availability Zones.
Which of the following features should the Solutions Architect use to satisfy these criteria?

  • A. Cross-zone load balancing
  • B. Amazon VPC IP Address Manager (IPAM)
  • C. AWS Direct Connect SiteLink
  • D. Path-based Routing

正解: A

解説:
The nodes for your load balancer distribute requests from clients to registered targets. When cross-zone load balancing is enabled, each load balancer node distributes traffic across the registered targets in all enabled Availability Zones. When cross-zone load balancing is disabled, each load balancer node distributes traffic only across the registered targets in its Availability Zone.
The following diagrams demonstrate the effect of cross-zone load balancing. There are two enabled Availability Zones, with two targets in Availability Zone A and eight targets in Availability Zone
B: Clients send requests, and Amazon Route 53 responds to each request with the IP address of one of the load balancer nodes. This distributes traffic such that each load balancer node receives 50% of the traffic from the clients. Each load balancer node distributes its share of the traffic across the registered targets in its scope.
If cross-zone load balancing is enabled, each of the 10 targets receives 10% of the traffic. This is because each load balancer node can route 50% of the client traffic to all 10 targets.

If cross-zone load balancing is disabled:
Each of the two targets in Availability Zone A receives 25% of the traffic.
Each of the eight targets in Availability Zone B receives 6.25% of the traffic.
This is because each load balancer node can route 50% of the client traffic only to targets in its Availability Zone.

With Application Load Balancers, cross-zone load balancing is always enabled.
With Network Load Balancers and Gateway Load Balancers, cross-zone load balancing is disabled by default. After you create the load balancer, you can enable or disable cross-zone load balancing at any time.
When you create a Classic Load Balancer, the default for cross-zone load balancing depends on how you create the load balancer. With the API or CLI, cross-zone load balancing is disabled by default. With the AWS Management Console, the option to enable cross-zone load balancing is selected by default.
After you create a Classic Load Balancer, you can enable or disable cross-zone load balancing at any time Hence, the right answer is to enable cross-zone load balancing.
Amazon VPC IP Address Manager (IPAM) is incorrect because this is merely a feature in Amazon VPC that provides network administrators with an automated IP management workflow. It does not enable your load balancers to distribute incoming requests evenly to all EC2 instances across multiple Availability Zones.
Path-based Routing is incorrect because this feature is based on the paths that are in the URL of the request. It automatically routes traffic to a particular target group based on the request URL. This feature will not set each of the load balancer nodes to distribute traffic across the registered targets in all enabled Availability Zones.
AWS Direct Connect SiteLink is incorrect because this is a feature of AWS Direct Connect connection and not of Amazon Elastic Load Balancing. The AWS Direct Connect SiteLink feature simply lets you create connections between your on-premises networks through the AWS global network backbone.
References:
https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/how-elastic-load-balancing-works.html
https://aws.amazon.com/elasticloadbalancing/features
https://aws.amazon.com/blogs/aws/network-address-management-and-auditing-at-scale-with-amazon-vpc-ip-address-manager/
AWS Elastic Load Balancing Overview:
https://youtu.be/UBl5dw59DO8
Check out this AWS Elastic Load Balancing (ELB) Cheat Sheet:
https://tutorialsdojo.com/aws-elastic-load-balancing-elb/

 

質問 47
A company plans to migrate a NoSQL database to an EC2 instance. The database is configured to replicate the data automatically to keep multiple copies of data for redundancy. The Solutions Architect needs to launch an instance that has a high IOPS and sequential read/write access.
Which of the following options fulfills the requirement if I/O throughput is the highest priority?

  • A. Use Compute optimized instance with instance store volume.
  • B. Use Memory optimized instances with EBS volume.
  • C. Use Storage optimized instances with instance store volume.
  • D. Use General purpose instances with EBS volume.

正解: C

解説:
Amazon EC2 provides a wide selection of instance types optimized to fit different use cases. Instance types comprise varying combinations of CPU, memory, storage, and networking capacity and give you the flexibility to choose the appropriate mix of resources for your applications. Each instance type includes one or more instance sizes, allowing you to scale your resources to the requirements of your target workload.

A storage optimized instance is designed for workloads that require high, sequential read and write access to very large data sets on local storage. They are optimized to deliver tens of thousands of low- latency, random I/O operations per second (IOPS) to applications. Some instance types can drive more I/O throughput than what you can provision for a single EBS volume. You can join multiple volumes together in a RAID 0 configuration to use the available bandwidth for these instances.
Based on the given scenario, the NoSQL database will be migrated to an EC2 instance. The suitable instance type for NoSQL database is I3 and I3en instances. Also, the primary data storage for I3 and I3en instances is non-volatile memory express (NVMe) SSD instance store volumes. Since the data is replicated automatically, there will be no problem using an instance store volume.
Hence, the correct answer is: Use Storage optimized instances with instance store volume.
The option that says: Use Compute optimized instances with instance store volume is incorrect because this type of instance is ideal for compute-bound applications that benefit from high-performance processors. It is not suitable for a NoSQL database.
The option that says: Use General purpose instances with EBS volume is incorrect because this instance only provides a balance of computing, memory, and networking resources. Take note that the requirement in the scenario is high sequential read and write access. Therefore, you must use a storage optimized instance.
The option that says: Use Memory optimized instances with EBS volume is incorrect. Although this type of instance is suitable for a NoSQL database, it is not designed for workloads that require high, sequential read and write access to very large data sets on local storage.
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/storage-optimized-instances.html
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html Amazon EC2 Overview:
https://www.youtube.com/watch?v=7VsGIHT_jQE
Check out this Amazon EC2 Cheat Sheet:
https://tutorialsdojo.com/amazon-elastic-compute-cloud-amazon-ec2/

 

質問 48
……

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