20+ practice questions focused on Operations and Maintenance — one of the most tested topics on the AWS Certified SAP on AWS Specialty PAS-C01 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Operations and Maintenance PracticeA company runs a production EC2 instance that experiences intermittent connectivity issues. The instance is part of an Auto Scaling group behind an Application Load Balancer. Which step should be taken FIRST to diagnose the issue?
Explanation: Reviewing CloudWatch metrics for the instance and the ALB target group is the correct first step because it provides immediate visibility into the root cause of intermittent connectivity issues. Metrics such as TargetResponseTime, RequestCount, and HealthyHostCount can reveal whether the problem is due to high latency, request failures, or the instance being marked unhealthy by the ALB health checks. This data-driven approach avoids unnecessary changes and aligns with the AWS Well-Architected Framework's principle of observability.
A company uses AWS Systems Manager Patch Manager to patch a fleet of EC2 instances. After a recent patching operation, some instances failed with the error 'Unable to retrieve patch baseline'. The instances are in a private subnet with a VPC endpoint for SSM. What is the MOST likely cause?
Explanation: The error 'Unable to retrieve patch baseline' indicates that the EC2 instances cannot communicate with the AWS Systems Manager service to fetch the patch baseline configuration. Since the instances are in a private subnet with a VPC endpoint for SSM, the most likely cause is that the VPC endpoint's security group does not allow HTTPS outbound traffic (port 443) to the endpoint itself. Without this outbound rule, the SSM Agent on the instance cannot establish the TLS connection required to retrieve the patch baseline from the SSM API.
A company runs a critical application on an EC2 instance that uses a large EBS volume for database storage. The volume is not encrypted at rest. To meet compliance requirements, the company must enable encryption on the volume with minimal downtime. Which solution meets these requirements?
Explanation: Option A is correct because taking a snapshot of the unencrypted volume with encryption enabled creates an encrypted snapshot. From that snapshot, you can create a new encrypted EBS volume. Detaching the original volume and attaching the new encrypted volume to the same EC2 instance achieves encryption with minimal downtime—only the brief period required for the detach/attach operations. This approach does not require copying the snapshot, which would add unnecessary time.
A DevOps engineer needs to automatically restart a specific service on an EC2 instance whenever the service crashes. The instance is running Amazon Linux 2. Which approach is the MOST operationally efficient?
Explanation: Option C is correct because systemd, the default init system on Amazon Linux 2, provides a built-in `Restart=` directive that can be set to `on-failure`. This instructs systemd to automatically restart the service unit when it exits with a non-zero exit code or is terminated by a signal, without requiring any external monitoring or additional infrastructure. This is the most operationally efficient approach as it leverages the native service manager functionality with zero external dependencies.
A company has a CloudFormation stack that creates an EC2 instance with a custom AMI. The stack fails with the error 'Resource creation cancelled' during creation. The engineer checks the stack events and sees that the EC2 instance creation succeeded, but the subsequent creation of an EBS volume failed. What is the MOST likely reason for the failure?
Explanation: Option C is correct because when an EBS volume creation fails in a CloudFormation stack, the stack initiates a rollback of all previously created resources, including the EC2 instance. The 'Resource creation cancelled' error appears for the EC2 instance because its creation was successful but then undone during the rollback, not because it failed initially.
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Practice all Operations and Maintenance questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Operations and Maintenance. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Operations and Maintenance questions on the PAS-C01 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Operations and Maintenance is tested as part of the AWS Certified SAP on AWS Specialty PAS-C01 blueprint. Practicing with targeted Operations and Maintenance questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Operations and Maintenance is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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