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Amazon AWS Certified DevOps Engineer - Professional (DOP-C01) Sample Questions (Q174-Q179):

NEW QUESTION # 174
A DevOps Engineer is working on a project that is hosted on Amazon Linux and has failed a security review. The DevOps Manager has been asked to review the company buildspec.yami file for an AWS CodeBuild project and provide recommendations. The builspec.yami file is configured as follows:

What changes should be recommended to comply with AWS security best practices? (Select THREE.)

• A. Use AWS Systems Manager run command versus scp and ssh commands directly to the instance.
• B. Store the DBPASSWORD as a SecurityString value in AWS Systems Manager Parameter Store and then remove the DBPASSWORD from the environment variables.
• C. Add a post-build command to remove the temporary files from the container before termination to ensure they cannot be seen by other CodeBuild users.
• D. Scramble the environment variables using XOR followed by Base64, add a section to install, and then run XOR and Base64 to the build phase.
• E. Move the environment variables to the `db-deploy-bucket' Amazon S3 bucket, add a prebuild stage to download, then export the variables.
• F. Update the CodeBuild project role with the necessary permissions and then remove the AWS credentials from the environment variable.

Answer: A,C,E
NEW QUESTION # 175
A web application is being actively developed by multiple development teams within your organization. You have created a self-service portal-driven by AWS CloudFormation and the AWS APIs-that allows testers to select a code branch containing a new feature that they want to test. The portal will then provision an environment and deploy the right branch of code to it. Recently you have noticed that a large number of environments contain broken builds. You want to introduce a set of automated browser tests that are executed on a new environment before the environment is available to the tester. This way a tester does not waste time trying to test new features in a broken environment.
Select a suitable way to implement such a feature into the existing self-service portal:

• A. Configure a centralized test server that hosts an automated browser testing framework. Use an AWS CloudFormation custom resource to notify the centralized test server, via an Amazon SNS topic, that a new environment has been initialized. The centralized test server can then execute the tests before sending the results back to the AWS CloudFormation service.
• B. Configure a centralized test server that hosts an automated browser testing framework. Include an Amazon SES email resource under the outputs section of your AWS CloudFormation template. This we send an email to your centralized test server, informing it that the environment is ready for tests.
• C. Specify your automated tests in the "tests" section of the AWS CloudFormation template. AWS CloudFormation will then execute the tests on your behalf as part of the environment build.
• D. Pass the test scripts to the cfn-init service via the "tests" section of the AWS::CloudFormation::Init metadata. Cfn-init will then execute these tests and return the result to the AWS CloudFormation service.

Answer: A
NEW QUESTION # 176
You have a set of EC2 Instances in an Autoscaling Group that processes messages from an SQS queue. The
messages contain the location in S3 from where video's need to be processed by the EC2 Instances. When a
scale in happens, it is noticed that an at times that the EC2 Instance is still in a state of processing a video
when the instance is terminated. How can you implement a solution which will ensure this does not happen?

• A. Uselifecycle hooks to ensure the processing is complete before the terminationoccurs
• B. ChangetheCoolDown property for the Autoscaling Group.
• C. Increasethe minimum and maximum size for the Auto Scaling group, and change the scalingpolicies so
  they scale less dynamically
• D. SuspendtheAZRebalance termination policy

Answer: A Explanation:
Explanation
This is a case where lifecycle policies can be used. The lifecycle policy can be used to put the instance in a
state of Terminating:Wait, complete the processing and then send a signal to complete the termination
Auto Scaling lifecycle hooks enable you to perform custom actions by pausing instances as Auto Scaling
launches or terminates them. For example, while your newly launched instance is paused, you could install or
configure software on it.
For more information on Autoscaling lifecycle hooks, please visit the below U RL:
* http://docs.aws.a
mazon.com/autoscaling/latest/userguide/lifecycle-hooks.htm I
NEW QUESTION # 177
Your system automatically provisions EIPs to EC2 instances in a VPC on boot. The system provisions the whole VPC and stack at once. You have two of them per VPC. On your new AWS account, your attempt to create a Development environment failed, after successfully creating Staging and Production environments in the same region. What happened?

• A. You didn't choose the Development version of the AMI you are using.
• B. You hit the soft limit of 2 VPCs per region and requested a 3rd.
• C. You hit the soft limit of 5 EIPs per region and requested a 6th.
• D. You didn't set the Development flag to true when deploying EC2 instances.

Answer: C Explanation:
There is a soft limit of 5 EIPs per Region for VPC on new accounts. The third environment could not allocate the 6th EIP.
http://docs.aws.amazon.com/general/latest/gr/awsservicelimits.html#limits_vpc
NEW QUESTION # 178
A Development team is building more than 40 applications. Each app is a three-tiered web application based on an ELB Application Load Balancer, Amazon EC2, and Amazon RDS. Because the applications will be used internally, the Security team wants to allow access to the 40 applications only from the corporate network and block access from external IP addresses. The corporate network reaches the internet through proxy servers. The proxy servers have 12 proxy IP addresses that are being changed one or two times per month. The Network Infrastructure team manages the proxy servers; they upload the file that contains the latest proxy IP addresses into an Amazon S3 bucket. The DevOps Engineer must build a solution to ensure that the applications are accessible from the corporate network. Which solution achieves these requirements with MINIMAL impact to application development, MINIMAL operational effort, and the LOWEST infrastructure cost?

• A. Enable ELB security groups to allow HTTPS inbound access from the Internet. Use Amazon Cognito to integrate the company's Active Directory as the identity provider. Change the 40 applications to integrate with Amazon Cognito so that only company employees can log into the application. Save the user access logs to Amazon CloudWatch Logs to record user access activities
• B. Implement a Python script with the AWS SDK for Python (Boto), which downloads the S3 object that contains the proxy IP addresses, scans the ELB security groups, and updates them to allow only HTTPS inbound from the given IP addresses. Launch an EC2 instance and store the script in the instance. Use a cron job to execute the script daily.
• C. Ensure that all the applications are hosted in the same Virtual Private Cloud (VPC). Otherwise, consolidate the applications into a single VPC. Establish an AWS Direct Connect connection with an active/standby configuration. Change the ELB security groups to allow only inbound HTTPS connections from the corporate network IP addresses.
• D. Implement an AWS Lambda function to read the list of proxy IP addresses from the S3 object and to update the ELB security groups to allow HTTPS only from the given IP addresses. Configure the S3 bucket to invoke the Lambda function when the object is updated. Save the IP address list to the S3 bucket when they are changed.

Answer: D
NEW QUESTION # 179
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