試験の準備方法-完璧なSOA-C03学習範囲試験-検証するSOA-C03試験解説

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Amazon SOA-C03 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Networking and Content Delivery	18%	- Configure DNS and content delivery 1. Manage Amazon Route 53 hosted zones and routing policies 2. Configure Amazon CloudFront distributions - Implement and manage networking configurations 1. Implement VPC peering, AWS Transit Gateway, and VPN connections 2. Configure VPCs, subnets, route tables, and internet gateways - Implement network security and troubleshooting 1. Configure network access control lists (NACLs) and security groups 2. Troubleshoot network connectivity issues using VPC Flow Logs
Topic 2: Monitoring, Logging, Analysis, Remediation, and Performance Optimization	22%	- Implement metrics, alarms, and filters by using AWS monitoring and logging services 1. Create and manage CloudWatch alarms, dashboards, and metric filters 2. Configure and manage the CloudWatch agent to collect metrics and logs from EC2 instances, Amazon ECS clusters, or Amazon EKS clusters 3. Configure AWS monitoring and logging by using AWS services (e.g., Amazon CloudWatch, AWS CloudTrail) - Optimize performance of AWS resources 1. Implement performance tuning for EC2 instances, databases, and other AWS services 2. Use AWS Compute Optimizer and AWS Trusted Advisor for performance recommendations - Implement remediation actions based on monitoring and logging data 1. Troubleshoot and resolve operational issues using monitoring data 2. Configure automated remediation using AWS Systems Manager, AWS Lambda, or Amazon EventBridge
Topic 3: Security and Compliance	16%	- Ensure compliance requirements are met 1. Use AWS Config, AWS CloudTrail, and Amazon GuardDuty for compliance monitoring 2. Enforce compliance requirements (e.g., Region and service selections) - Implement and manage security controls 1. Implement security groups, NACLs, and AWS WAF 2. Configure IAM users, groups, roles, and policies - Implement data protection 1. Manage SSL/TLS certificates using AWS Certificate Manager 2. Configure encryption at rest and in transit
Topic 4: Deployment, Provisioning, and Automation	22%	- Manage configuration and secrets 1. Implement configuration management strategies 2. Use AWS Systems Manager Parameter Store and AWS Secrets Manager - Provision and maintain AWS resources 1. Create and manage infrastructure as code using AWS CloudFormation and AWS CDK 2. Manage stacks of resources by using CloudFormation - Implement automation for operational tasks 1. Automate deployments using AWS CodeDeploy, AWS CodePipeline 2. Use AWS Systems Manager for patch management and maintenance
Topic 5: Reliability and Business Continuity	22%	- Implement scalability and elasticity 1. Configure Auto Scaling groups and policies 2. Implement load balancing strategies using ELB - Implement backup and recovery strategies 1. Configure AWS Backup for automated backups 2. Implement disaster recovery procedures and test recovery processes - Implement high availability and fault tolerance 1. Configure multi-AZ and multi-Region architectures 2. Deploy resources across multiple Availability Zones

>> SOA-C03学習範囲 <<

Amazon SOA-C03試験解説、SOA-C03テスト内容

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Amazon AWS Certified CloudOps Engineer - Associate 認定 SOA-C03 試験問題 (Q144-Q149):

質問 # 144
A company has AWS accounts in an organization in AWS Organizations. The company has built an AWS Lambda function in one account. The Lambda function needs to retrieve a list of Amazon EC2 instances that are running in another account. Which solution will provide this access MOST securely?

A. Create an IAM user in the account where the EC2 instances are running. Collect access keys from the user. Store these credentials in AWS Systems Manager Parameter Store in the account of the Lambda function. Configure the Lambda function to use the access key and the secret key.
B. Configure the Lambda function's execution role to assume a cross-account IAM role in the account where the EC2 instances are running. Modify the trust policy of the cross-account role to allow the Lambda function to assume the role. Add the AWS STS AssumeRole API operation to the Lambda function's code.
C. Create a new resource-based policy for the Lambda function. In the policy, set the Principal to "*" and set the Action to lambda:InvokeFunction. Create a condition on the policy to allow access when the value of the aws:PrincipalOrgID condition key matches the organization's ID.
D. From the management account in the organization, call the Organizations CreatePolicy API operation to create a new service control policy (SCP). Configure the SCP to grant lambda:InvokeFunction permission. Assign the SCP to the organization root.

正解：B

解説：
Using a cross-account IAM role with AWS STS AssumeRole provides temporary credentials and avoids storing long-term access keys. The target account can grant only the permissions required to list EC2 instances, while the role's trust policy limits which Lambda execution role can assume it.

質問 # 145
A company uses Amazon S3 for object storage. A CloudOps engineer notices that the company's Amazon S3 usage has doubled every month across all the company's S3 buckets for the previous year. The company stores and consumes data in the same AWS Region where the data is generated. The company never accesses data that is older than 30 days. The CloudOps engineer needs to optimize Amazon S3 costs for the company. Which solution will meet this requirement with the LEAST operational overhead?

A. Configure an S3 Lifecycle policy to expire any object that was created more than 30 days ago.
B. Modify the object creation lifecycle to check for and delete any objects that were created more than 30 days ago.
C. Create an AWS Lambda function to delete data that is older than 30 days. Use an Amazon EventBridge cron expression to invoke the function monthly.
D. Use S3 Storage Lens to identify objects that are older than 30 days across all S3 buckets.

正解：A

解説：
S3 Lifecycle policies are the correct managed mechanism for automatically expiring objects after a defined age. Because the company never accesses data older than 30 days, an expiration rule can delete objects after 30 days and reduce storage growth without custom code. This has the least operational overhead because S3 performs the expiration automatically. Option A introduces Lambda code, scheduling, permissions, retries, and edge-case handling, which is unnecessary. S3 Storage Lens can identify usage trends and aging objects, but it does not itself delete objects or enforce retention. Option C is vague and not an AWS-managed configuration as written. For CloudOps cost optimization, lifecycle expiration is the standard approach when objects have a predictable retention period and no long-term access requirement.

質問 # 146
A CloudOps engineer needs to control access to groups of Amazon EC2 instances using AWS Systems Manager Session Manager. Specific tags on the EC2 instances have already been added.
Which additional actions should the CloudOps engineer take to control access? (Select TWO.)

A. Attach an IAM policy to the users or groups that require access to the EC2 instances.
B. Create an IAM policy that grants access to any EC2 instances with a tag specified in the Condition element.
C. Attach an IAM role to control access to the EC2 instances.
D. Create a service account and attach it to the EC2 instances that need to be controlled.
E. Create a placement group for the EC2 instances and add a specific tag.

正解：A、B

解説：
AWS Systems Manager Session Manager allows secure, auditable instance access without SSH keys or inbound ports. To control access based on instance tags, CloudOps best practices require two configurations:
Attach an IAM policy to users or groups granting ssm:StartSession,
ssm:DescribeInstanceInformation, and ssm:DescribeSessions.
Include a Condition element in the IAM policy referencing instance tags, such as Condition:
{"StringEquals": {"ssm:resourceTag/Environment": "Production"}}.
This ensures users can start sessions only with instances that have matching tags, providing fine- grained access control.
AWS CloudOps documentation under Security and Compliance states:
"Use IAM policies with resource tags in the Condition element to restrict which managed instances users can access using Session Manager." Options B and D incorrectly suggest attaching roles or service accounts that are not relevant to user-level access control. Option C (placement groups) pertains to networking and performance, not access management. Therefore, A and E together provide tag-based, least-privilege access as required.

質問 # 147
A SysOps administrator monitors and maintains the availability of resources in an AWS environment. The SysOps administrator notices that the CPU utilization of an Amazon EC2 instance that runs web server software peaks above 80% at various times during each day. The CPU spikes correlate with peak daily loads. The high CPU load has resulted in performance issues for customers.
The SysOps administrator needs to resolve the system performance issue without causing any service disruptions. Which solution will meet these requirements?

A. Set up an Auto Scaling group with an Amazon CloudWatch alarm that triggers a scaling policy to launch additional EC2 instances when the CPU utilization exceeds 80%.
B. Configure an Amazon EventBridge rule that invokes an AWS Systems Manager Automation document. Configure the document to increase the EC2 instance size when CPU utilization exceeds 80%.
C. Configure an Amazon CloudWatch alarm that invokes an AWS Systems Manager Automation runbook to vertically scale the EC2 instance when the CPU utilization exceeds 80%.
D. Configure an AWS Systems Manager Automation runbook to run a script that automatically restarts the application when CPU utilization exceeds 80%.

正解：A

解説：
The requirement is to fix performance degradation from predictable peak CPU load without service disruptions. The most reliable and operationally standard approach is horizontal scaling with an Auto Scaling group driven by CloudWatch metrics/alarms (or target tracking). Launching additional instances and distributing traffic (typically behind a load balancer) increases capacity while keeping existing instances serving requests--no reboot or stop/start required.
Option D meets the requirement because Auto Scaling can add capacity when CPU exceeds a threshold and remove capacity when demand falls. This improves performance during peak periods and maintains availability. It is also operationally efficient: scaling actions are automated, consistent, and can be tuned with cooldowns/health checks.

質問 # 148
A CloudOps engineer is creating two AWS CloudFormation templates. The first template will create a VPC with associated resources, such as subnets, route tables, and an internet gateway.
The second template will deploy application resources within the VPC that was created by the first template. The second template should refer to the resources created by the first template.
How can this be accomplished with the LEAST amount of administrative effort?

A. Add an export field to the outputs of the first template and import the values in the second template.
B. Input the names of resources in the first template and refer to those names in the second template as a parameter.
C. Create a mapping in the first template that is referenced by the second template.
D. Create a custom resource that queries the stack created by the first template and retrieves the required values.

正解：A

解説：
CloudFormation cross-stack references are the correct low-effort method for sharing resource values between related stacks. The first template can define stack outputs and mark them with an Export name. The second template can use Fn::ImportValue to reference those exported values, such as VPC ID, subnet IDs, route table IDs, or security group IDs. AWS documentation states that you use the Export output field and Fn::ImportValue intrinsic function to create cross-stack references. A custom resource is unnecessary and adds code, permissions, and maintenance.
Mappings are static lookup tables, not a way to retrieve live resources from another stack.
Passing values manually as parameters works, but it increases administrative effort and error risk. Therefore, exports and imports are correct.

質問 # 149
......

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