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Exam Topics

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SDLC Automation (22%)

Defining the strategies for source control;
Applying the concepts for managing and building artifacts securely;
Applying the concepts required for automating a CD/CI pipeline.
Applying the concepts for integrating and automating testing;
Determining the deployment strategies;

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q407-Q412):

NEW QUESTION # 407
You work for a startup that has developed a new photo-sharing application for mobile devices. Over recent months your application has increased in popularity; this has resulted in a decrease in the performance of the application clue to the increased load. Your application has a two-tier architecture that is composed of an Auto Scaling PHP application tier and a MySQL RDS instance initially deployed with AWS Cloud Formation. Your Auto Scaling group has a min value of 4 and a max value of 8. The desired capacity is now at 8 because of the high CPU utilization of the instances. After some analysis, you are confident that the performance issues stem from a constraint in CPU capacity, although memory utilization remains low. You therefore decide to move from the general-purpose M3 instances to the compute-optimized C3 instances. How would you deploy this change while minimizing any interruption to your end users?

A. Sign into the AWS Management Console, and update the existing launch configuration with the new C3 instance type. Add an UpdatePolicy attribute to your Auto Scaling group that specifies AutoScalingRollingUpdate.
B. Update the launch configuration specified in the AWS CloudFormation template with the new C3 instance type. Run a stack update with the new template. Auto Scaling will then update the instances with the new instance type.
C. Sign into the AWS Management Console, copy the old launch configuration, and create a new launch configuration that specifies the C3 instances. Update the Auto Scalinggroup with the new launch configuration. Auto Scaling will then update the instance type of all running instances.
D. Update the launch configuration specified in the AWS CloudFormation template with the new C3 instance type. Also add an UpdatePolicy attribute to your Auto Scalinggroup that specifies AutoScalingRollingUpdate. Run a stack update with the new template.

Answer: D

Explanation:
Explanation
The AWS::AutoScaling::AutoScalingGroup resource supports an UpdatePoIicy attribute. This is used to define how an Auto Scalinggroup resource is updated when an update to the Cloud Formation stack occurs. A common approach to updating an Auto Scaling group is to perform a rolling update, which is done by specifying the AutoScalingRollingUpdate policy. This retains the same Auto Scaling group and replaces old instances with new ones, according to the parameters specified. For more information on rolling updates, please visit the below link:
* https://aws.amazon.com/premiumsupport/knowledge-center/auto-scaling-group-rolling-updates/

NEW QUESTION # 408
An application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). A DevOps Engineer is using AWS CodeDeploy to release a new version. The deployment fails during the AllowTraffic lifecycle event, but a cause for the failure is not indicated in the deployment logs.
What would cause this?

A. The appspec.yml file contains an invalid script to execute in the AllowTraffic lifecycle hook.
B. The CodeDeploy agent was not installed in the EC2 instances that are part of the ALB target group.
C. The health checks specified for the ALB target group are misconfigured.
D. The user who initiated the deployment does not have the necessary permissions to interact with the ALB.

Answer: C

Explanation:
Explanation/Reference: https://docs.amazonaws.cn/en_us/codedeploy/latest/userguide/codedeploy-user.pdf (399)

NEW QUESTION # 409
A company is running three production web server reserved EC2 instances with EBS-backed root volumes.
These instances have a consistent CPU load of 80%. Traffic is being distributed to these instances by an
Elastic Load Balancer. They also have production and development Multi-AZ RDS MySQL databases. What
recommendation would you make to reduce cost in this environment without affecting availability of
mission-critical systems? Choose the correct answer from the options given below

A. Considerremovingthe Elastic Load Balancer
B. Considerusing on-demand instances instead of reserved EC2 instances
C. Considerusing spot instances instead of reserved EC2 instances
D. Considernot using a Multi-AZ RDS deployment for the development database

Answer: D

Explanation:
Explanation
Multi-AZ databases is better for production environments rather than for development environments, so you
can reduce costs by not using this for development environments
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 (or to a read
replica in the case of Amazon Aurora), so that you can resume database operations as soon as the failover is
complete. Since the endpoint for your DB Instance remains the same after a failover, your application can
resume database operation without the need for manual administrative intervention
For more information on Multi-AZ RDS, please refer to the below link:
* https://aws.amazon.com/rds/details/multi-az/

NEW QUESTION # 410
Your application stores sensitive information on an EBS volume attached to your EC2 instance.
How can you protect your information? Choose two answers from the options given below

A. Create and mount a new, encrypted Amazon EBS volume. Move the data to the new volume. Delete the old Amazon EBS volume.
B. It is not possible to encrypt an EBS volume, you must use a lifecycle policy to transfer data to S3 for encryption.
C. Unmount the EBS volume, take a snapshot and encrypt the snapshot. Re-mount the Amazon EBS volume
D. Copy the unencrypted snapshot and check the box to encrypt the new snapshot. Volumes restored from this encrypted snapshot will also be encrypted.

Answer: A,D

Explanation:
These steps are given in the AWS documentation
To migrate data between encrypted and unencrypted volumes
1) Create your destination volume (encrypted or unencrypted, depending on your need).
2) Attach the destination volume to the instance that hosts the data to migrate.
3) Make the destination volume available by following the procedures in Making an Amazon EBS Volume Available for Use. For Linux instances, you can create a mount point at /mnt/destination and mount the destination volume there.
4) Copy the data from your source directory to the destination volume. It may be most convenient to use a bulk-copy utility for this.
To encrypt a volume's data by means of snapshot copying
1) Create a snapshot of your unencrypted CBS volume. This snapshot is also unencrypted.
2) Copy the snapshot while applying encryption parameters. The resulting target snapshot is encrypted.
3) Restore the encrypted snapshot to a new volume, which is also encrypted.
For more information on EBS Encryption, please refer to the below document link: from AWS
http://docs.aws.a mazon.com/AWSEC2/latest/UserGuide/ EBSEncryption.html

NEW QUESTION # 411
Which of the following will you need to consider so you can set up a solution that incorporates single sign-on from your corporate AD or LDAP directory and restricts access for each user to a designated user folder in a bucket? Choose 3 Answers from the options below

A. Setting up a federation proxy or identity provider
B. Configuring 1AM role
C. Setting up a matching 1AM user for every user in your corporate directory that needs access to a folder in the bucket
D. Tagging each folder in the bucket
E. Using AWS Security Token Service to generate temporary tokens

Answer: A,B,E

Explanation:
Explanation
The below diagram showcases how authentication is carried out when having an identity broker. This is an example of a SAML connection, but the same concept holds true for getting access to an AWS resource.

For more information on federated access, please visit the below link:
* http://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_com
mon-scenarios_federated-users.htm I
* https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_create_for-idp_samI.html?icmpid=docs_iam_console
* https://aws.amazon.com/blogs/security/writing-iam-policies-grant-access-to-user-specific-folders-in-an-amazon-s3-bucket/

NEW QUESTION # 412
......

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