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Amazon SOA-C03 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Networking and Content Delivery: This section measures skills of Cloud Network Engineers and focuses on VPC configuration, subnets, routing, network ACLs, and gateways. It includes optimizing network cost and performance, configuring DNS with Route 53, using CloudFront and Global Accelerator for content delivery, and troubleshooting network and hybrid connectivity using logs and monitoring tools.
トピック 2	Monitoring, Logging, Analysis, Remediation, and Performance Optimization: This section of the exam measures skills of CloudOps Engineers and covers implementing AWS monitoring tools such as CloudWatch, CloudTrail, and Prometheus. It evaluates configuring alarms, dashboards, and notifications, analyzing performance metrics, troubleshooting issues using EventBridge and Systems Manager, and applying strategies to optimize compute, storage, and database performance.
トピック 3	Reliability and Business Continuity: This section measures the skills of System Administrators and focuses on maintaining scalability, elasticity, and fault tolerance. It includes configuring load balancing, auto scaling, Multi-AZ deployments, implementing backup and restore strategies with AWS Backup and versioning, and ensuring disaster recovery to meet RTO and RPO goals.
トピック 4	Security and Compliance: This section measures skills of Security Engineers and includes implementing IAM policies, roles, MFA, and access controls. It focuses on troubleshooting access issues, enforcing compliance, securing data at rest and in transit using AWS KMS and ACM, protecting secrets, and applying findings from Security Hub, GuardDuty, and Inspector.
トピック 5	Deployment, Provisioning, and Automation: This section measures the skills of Cloud Engineers and covers provisioning and maintaining cloud resources using AWS CloudFormation, CDK, and third-party tools. It evaluates automation of deployments, remediation of resource issues, and managing infrastructure using Systems Manager and event-driven processes like Lambda or S3 notifications.

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Amazon AWS Certified CloudOps Engineer - Associate 認定 SOA-C03 試験問題 (Q135-Q140):

質問 # 135
A CloudOps engineer has many Windows Amazon EC2 instances that need to share a file system between nodes. The CloudOps engineer creates an Amazon EFS file share. After creation of the file share, the CloudOps engineer is having trouble mounting the file share to the EC2 instances. Which action should the CloudOps engineer take so that the EC2 instances can share the files?

A. Delete the EFS file share. Create an Amazon FSx for Windows File Server file share for the EC2 instances.
B. Allow the correct port for NFS through the security group and network ACL.
C. Use the correct IAM credentials to mount the EFS file share.
D. Configure NFSv4 support on the Windows operating system that is running on the EC2 instances.

正解：A

解説：
Amazon EFS is a Linux-oriented NFS file system and is not the preferred managed file-share service for Windows workloads. For Windows EC2 instances that need shared file storage, Amazon FSx for Windows File Server is the correct service because it provides a fully managed Windows file system using the SMB protocol and integrates with Microsoft Active Directory. This matches Windows application expectations and avoids forcing Windows instances into an unsuitable NFS-based design.

質問 # 136
A company wants to apply an existing Amazon Route 53 private hosted zone to a new VPC to allow for customized resource name resolution within the VPC. The CloudOps engineer created the VPC and added the appropriate resource record sets to the private hosted zone.
Which step should the CloudOps engineer take to complete the setup?

A. Ensure there is a route to the Route 53 Resolver in each of the VPC route tables.
B. Associate the Route 53 private hosted zone with the VPC.
C. Create a rule in the default security group for the VPC that allows traffic to the Route 53 Resolver.
D. Ensure the VPC network ACLs allow traffic to the Route 53 Resolver.

正解：B

解説：
A Route 53 private hosted zone answers DNS queries only for VPCs that are associated with that hosted zone.
Creating the VPC and adding records to the private hosted zone is not enough; the private hosted zone must be associated with the VPC where resolution is needed. Once associated, resources in that VPC can resolve the private DNS names according to the record sets in the hosted zone, assuming normal VPC DNS settings are enabled. Security group rules, network ACL rules, and route table entries are not the required configuration step for associating Route 53 private DNS. Route 53 Resolver is provided by AWS inside the VPC and does not require routing to an external endpoint for this use case. Therefore, the missing step is the private hosted zone-to-VPC association.

質問 # 137
A company runs a high performance computing (HPC) data-processing application on Amazon EC2 instances in one Availability Zone within a development environment. The application uses a dataset that the company stores on an Amazon S3 general purpose bucket in the same AWS Region as the EC2 instances.
A SysOps administrator must improve the application's performance for retrieval of objects from Amazon S3.
Which solution will meet these requirements?

A. Enable S3 Transfer Acceleration for the S3 bucket. Create an S3 access point for the bucket.
Update the application to use the access point.
B. Create an S3 Lifecycle configuration for the S3 bucket to move all objects to the S3 Express One Zone storage class. Update the application to use an S3 Regional endpoint.
C. Create a second general purpose S3 bucket in the same Region. Copy the objects from the original bucket to the new bucket. Use the S3 Express One Zone storage class to store the objects in the new bucket. Update the application to use an S3 Regional endpoint.
D. Create an S3 directory bucket in the same Availability Zone. Import objects from the original bucket to the new bucket. Use the S3 Express One Zone storage class to store the objects in the new bucket. Update the application to use an S3 Zonal endpoint.

正解：D

解説：
Amazon S3 Express One Zone with directory buckets and zonal endpoints is specifically designed for single Availability Zone, high-performance workloads such as HPC, machine learning, and analytics applications running on Amazon EC2. AWS CloudOps documentation states that S3 Express One Zone delivers single-digit millisecond latency and up to 10x higher request performance compared to general purpose S3 buckets when data is accessed from the same Availability Zone.
An S3 directory bucket is required to use the S3 Express One Zone storage class. These buckets are explicitly associated with a single Availability Zone and use zonal endpoints, which eliminate cross-AZ network hops and significantly reduce latency. Importing the data from the existing general purpose bucket ensures compatibility while achieving maximum throughput and lowest latency.

質問 # 138
A company hosts a static website in Amazon S3 behind an Amazon CloudFront distribution. When new versions are deployed, users sometimes do not see updated content immediately.
Which solution will meet this requirement?

A. Modify the distribution settings to specify the protocol as HTTPS only.
B. Attach the CachingOptimized managed cache policy to the distribution.
C. Create a CloudFront invalidation.
D. Configure the CloudFront distribution to add a custom Cache-Control header to requests for content from the S3 bucket.

正解：C

解説：
The AWS Cloud Operations and Content Delivery documentation explains that Amazon CloudFront caches objects in edge locations for a defined time based on TTL settings or origin headers. When new content is deployed to the S3 origin, previously cached versions remain in edge caches until they expire.
To immediately serve the new version, CloudOps engineers must initiate a CloudFront invalidation, which removes cached objects from all edge locations. This forces CloudFront to fetch the latest version from the origin (S3).
Invalidations can target individual objects (e.g., /index.html) or wildcard paths (e.g., /*) and are the AWS-recommended approach for dynamic content refresh after static site updates.
Changing headers (Option A), enforcing HTTPS (Option B), or applying caching policies (Option C) do not directly refresh outdated cache content.
Thus, Option D - issuing a CloudFront invalidation - ensures users receive the latest website content immediately after deployment.

質問 # 139
A company moves workloads from public subnets to private subnets to improve security. During testing, servers in the private subnets cannot reach an external API. The VPC has a CIDR block of 10.0.0.0/16, two public subnets, two private subnets, one internet gateway, and a NAT gateway in each private subnet.
The company must ensure that workloads in the private subnets can reach the external API.
Which solution will meet this requirement?

A. Create an Amazon API Gateway HTTP API as a proxy.
B. Create a VPC interface endpoint and update route tables.
C. Deploy an outbound-only internet gateway and update route tables.
D. Deploy a NAT gateway in each public subnet and update private subnet route tables.

正解：D

解説：
For IPv4 traffic, private subnets require a NAT gateway in a public subnet to access the internet. NAT gateways must be deployed in public subnets and associated with an Elastic IP address. Private subnet route tables must direct 0.0.0.0/0 traffic to the NAT gateway.
The question states that NAT gateways are incorrectly placed in private subnets, which cannot provide internet access. Deploying NAT gateways in public subnets resolves this issue and restores outbound connectivity to external APIs.
Option A applies only to IPv6. Option B adds unnecessary complexity. Option D is not applicable because external APIs are not AWS services.

質問 # 140
......

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