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Free Amazon DOP-C01 Exam Actual Questions

The questions for DOP-C01 were last updated On Dec 14, 2025

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Question No. 1

A mobile application running on eight Amazon EC2 instances is relying on a third-party API endpoint. The thirdparty service has a high failure rate because of limited capacity, which is expected to be resolved in a few weeks. In the meantime, the mobile application developers have added a retry mechanism and are logging failed API requests. A DevOps Engineer must automate the monitoring of application logs and count the specific error messages; if there are more than 10 errors within a 1-minute window, the system must issue an alert. How can the requirements be met with MINIMAL management overhead?

AInstall the Amazon CloudWatch Logs agent on all instances to push the application logs to CloudWatch Logs. Use metric filters to count the error messages every minute, and trigger a CloudWatch alarm if the count exceeds 10 errors.

BInstall the Amazon CloudWatch Logs agent on all instances to push the access logs to CloudWatch Logs. Create CloudWatch Events rule to count the error messages every minute, and trigger a CloudWatch alarm if the count exceeds 10 errors.

CInstall the Amazon CloudWatch Logs agent on all instances to push the application logs to CloudWatchLogs. Use a metric filter to generate a custom CloudWatch metric that records the number of failures and triggers a CloudWatch alarm if the custom metric reaches 10 errors in a 1-minute period.

DDeploy a custom script on all instances to check application logs regularly in a cron job. Count the number of error messages every minute, and push a data point to a custom. CloudWatch metric. Trigger a CloudWatch alarm if the custom metric reaches 10 errors in a 1-minute period.

Show Answer

Correct Answer: C

Question No. 2

A company has developed a static website hosted on an Amazon S3 bucket. The website is deployed using AWS CloudFormation. The CloudFormation template defines an S3 bucket and a custom resource that copies content into the bucket from a source location. The company has decided that it needs to move the website to a new location, so the existing CloudFormation stack must be deleted and re-created. However, CloudFormation reports that the stack could not be deleted cleanly. What is the MOST likely cause and how can the DevOps Engineer mitigate this problem for this and future versions of the website?

ADeletion has failed because the S3 bucket has an active website configuration. Modify the CloudFormation template to remove the Website Configuration property from the S3 bucket resource.

BDeletion has failed because the S3 bucket is not empty. Modify the custom resource's AWS Lambda function code to recursively empty the bucket when is Delete. RequestType

CDeletion has failed because the custom resource does not define a deletion policy. Add a Deletion Policy property to the custom resource definition with a value of RemoveOnDeletion.

DDeletion has failed because the S3 bucket is not empty. Modify the S3 bucket resource in the CloudFormation template to add a Deletion Policy property with a value of Empty.

Show Answer

Correct Answer: D

Question No. 3

A company that runs many workloads on AWS has an Amazon EBS spend that has increased over time. The DevOps team notices there are many unattached EBS volumes. Although there are workloads where volumes are detached, volumes over 14 days old are stale and no longer needed. A DevOps engineer has been tasked with creating automation that deletes unattached EBS volumes that have been unattached for 14 days.

Which solution will accomplish this?

AConfigure the AWS Config ec2-vo!ume-inuse-check managed rule with a configuration changes trigger type and an Amazon EC2 volume resource target. Create a new Amazon CloudWatch Events rule scheduled to execute an AWS Lambda function in 14 days to delete the specified EBS volume.

BUse Amazon EC2 and Amazon Data Lifecycle Manager to configure a volume lifecycle policy. Set the interval period for unattached EBS volumes to 14 days and set the retention rule to delete. Set the policy target volumes as

CCreate an Amazon CloudWatch Events rule to execute an AWS Lambda function daily. The Lambda function should find unattached EBS volumes and tag them with the current date, and delete unattached volumes that have tags with dates that are more than 14 days old.

DUse AWS Trusted Advisor to detect EBS volumes that have been detached for more than 14 days. Execute an AWS Lambda function that creates a snapshot and then deletes the EBS volume.

Show Answer

Correct Answer: C

Question No. 4

You have an application consisting of a stateless web server tier running on Amazon EC2 instances behind load balancer, and are using Amazon RDS with read replicas. Which of the following methods should you use to implement a self-healing and cost-effective architecture? Choose 2 answers from the optionsgiven below

ASet up a third-party monitoring solution on a cluster of Amazon EC2 instances in order to emit custom Cloud Watch metrics to trigger the termination of unhealthy Amazon EC2 instances.

BSet up scripts on each Amazon EC2 instance to frequently send ICMP pings to the load balancer in order to determine which instance is unhealthy and replace it.

CSet up an Auto Scalinggroup for the web server tier along with an Auto Scaling policy that uses the Amazon RDS DB CPU utilization Cloud Watch metric to scale the instances.

DSet up an Auto Scalinggroup for the web server tier along with an Auto Scaling policy that uses the Amazon EC2 CPU utilization CloudWatch metric to scale the instances.

EUse a larger Amazon EC2 instance type for the web server tier and a larger DB instance type for the data storage layer to ensure that they don't become unhealthy.

FSet up an Auto Scalinggroup for the database tier along with an Auto Scaling policy that uses the Amazon RDS read replica lag CloudWatch metric to scale out the Amazon RDS read replicas.

GUse an Amazon RDS Multi-AZ deployment.

Show Answer

Correct Answer: D, G

The scaling of CC2 Instances in the Autoscaling group is normally done with the metric of the CPU

utilization of the current instances in the Autoscaling group

For more information on scaling in your Autoscaling Group, please refer to the below link:

* http://docs.aws.a mazon.com/autoscaling/latest/userguide/as-scaling-si mple-step.html

Amazon RDS Multi-AZ deployments provide enhanced availability and durability for Database (DB) Instances, making them a natural fit for production database workloads. When you provision a Multi-AZ DB Instance, Amazon RDS automatically creates a primary DB Instance and synchronously replicates the data to a standby instance in a different Availability Zone (AZ). Cach AZ runs on its own physically distinct, independent infrastructure, and is engineered to be highly reliable. In case of an infrastructure failure, Amazon RDS performs an automatic failover to the standby for to a read replica in the case of Amazon Aurora), so that you can resume database operations as soon as the failover is complete. For more information on RDS Multi-AZ please refer to the below link:

https://aws.amazon.com/rds/details/multi-az/

Option A is invalid because if you already have in-built metrics from Cloudwatch, why would you want to spend more in using a a third-party monitoring solution.

Option B is invalid because health checks are already a feature of AWS CLB

Option C is invalid because the database CPU usage should not be used to scale the web tier.

Option C is invalid because increasing the instance size does not always guarantee that the solution will not become unhealthy.

Option F is invalid because increasing Read-Replica's will not suffice for write operations if the primary DB fails.

Question No. 5

A DevOps engineer is writing an AWS CloudFormation template to stand up a web service that will run on Amazon EC2 instances in a private subnet behind an ELB Application Load Balancer. The Engineer must ensure that the service can accept requests from clients that have IPv6 addresses. Which configuration items should the Engineer incorporate into the CloudFormation template to allow IPv6 clients to access the web service?

AAssociate an IPv6 CIDR block with the Amazon VPC and subnets where the EC2 instances will live. Create route table entries for the IPv6 network, use EC2 instance types that support IPv6, and assign IPv6 addresses to each EC2 instance.

BReplace the Application Load Balancer with a Network Load Balancer. Associate an IPv6 CIDR block with the Virtual Private Cloud (VPC) and subnets where the Network Load Balancer lives, and assign the Network Load Balancer an IPv6 Elastic IP address.

CAssign each EC2 instance an IPv6 Elastic IP address. Create a target group and add the EC2 instances as targets. Create a listener on port 443 of the Application Load Balancer, and associate the newly created target group as the default target group.

DCreate a target group and add the EC2 instances as targets. Create a listener on port 443 of the Application Load Balancer. Associate the newly created target group as the default target group. Select a dual stack IP address, and create a rule in the security group that allows inbound traffic from anywhere.

Show Answer

Correct Answer: D