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Disaster Recovery, Fault Tolerance, and High Availability (16%)

• Determining how to automate and design various disaster recovery strategies;
• Determining the appropriate use of multi-region versus multi-AZ architectures;
• Defining the right service based on the business needs;
• Evaluating a deployment for the points of failure.
• Defining the implementation process of fault tolerance, scalability, and high availability;

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Policies and Standards Automation (10%)

• Applying the concepts required to implement the governance strategies;
• Applying the concepts that are required to implement standards for logging, security, testing, monitoring & metrics.
• Determining how to optimize the cost through automation;

Amazon AWS Certified DevOps Engineer - Professional (DOP-C01) Sample Questions (Q172-Q177):

NEW QUESTION # 172
You are currently using Elastic Beanstalk to host your production environment. You need to rollout updates to your application hosted on this environment. This is a critical application which is why there is a requirement that the rollback, if required, should be carried out with the least amount of downtime. Which of the following deployment strategies would ideally help achieve this purpose

• A. Create a Cloudformation template with the same resources as those in the Elastic beanstalk environment.
  If the deployment fails, deploy the Cloudformation template.
• B. Create another parallel environment in elastic beanstalk. Use the Swap URL feature.
• C. Use Rolling updates in Elastic Beanstalk so that if the deployment fails, the rolling updates feature would roll back to the last deployment.
• D. Create another parallel environment in elastic beanstalk. Create a new Route53 Domain name for the new environment and release that url to the users.

Answer: B

Explanation:
Explanation
Since the requirement is to have the least amount of downtime, the ideal way is to create a blue green deployment environment and then use the Swap URL feature to swap environments for the new deployment and then do the swap back, incase the deployment fails.
The AWS Documentation mentions the following on the SWAP url feature of Elastic Beanstalk Because Elastic Beanstalk performs an in-place update when you update your application versions, your application may become unavailable to users for a short period of time. It is possible to avoid this downtime by performing a blue/green deployment, where you deploy the new version to a separate environment, and then swap CNAMCs of the two environments to redirect traffic to the new version instantly.

NEW QUESTION # 173
You are a Devops Engineer for your company. There is a requirement to log each time an Instance is scaled in or scaled out from an existing Autoscaling Group. Which of the following steps can be implemented to fulfil this requirement. Each step forms part of the solution.

• A. Createa Cloudwatch event which will trigger the SQS queue.
• B. Createan SQS queue which will write the event to Cloudwatch logs
• C. Createa Cloudwatch event which will trigger the Lambda function.
• D. Createa Lambda function which will write the event to Cloudwatch logs

Answer: C,D

Explanation:
Explanation
The AWS documentation mentions the following
You can run an AWS Lambda function that logs an event whenever an Auto Scaling group launches or terminates an Amazon CC2 instance and whether the launch or terminate event was successful.
For more information on configuring lambda with Cloudwatch events for this scenario, please visit the URL:
http://docs.aws.a
mazon.com/AmazonCloudWatch/latest/events/LogASGro upState.html

NEW QUESTION # 174
A company is setting up a centralized logging solution on AWS and has several requirements. The company wants its Amazon CloudWatch Logs and VPC Flow logs to come from different sub accounts and to be delivered to a single auditing account. However, the number of sub accounts keeps changing. The company also needs to index the logs in the auditing account to gather actionable insight.
How should a DevOps Engineer implement the solution to meet all of the company's requirements?

• A. Use Amazon Kinesis Firehose with Kinesis Data Streams to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and stream logs from sub accounts to the Kinesis stream in the auditing account.
• B. Use AWS Lambda to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and use Lambda in the sub accounts to stream the logs to the Lambda function deployed in the auditing account.
• C. Use Amazon Kinesis Streams to write logs to Amazon ES in the auditing account. Create a CloudWatch subscription filter and use Kinesis Data Streams in the sub accounts to stream the logs to the Kinesis stream in the auditing account.
• D. Use AWS Lambda to write logs to Amazon ES in the auditing account. Create an Amazon CloudWatch subscription filter and use Amazon Kinesis Data Streams in the sub accounts to stream the logs to the Lambda function deployed in the auditing account.

Answer: A

NEW QUESTION # 175
A company has 100 GB of log data in an Amazon S3 bucket stored in .csv format. SQL developers want to query this data and generate graphs to visualize it. They also need an efficient, automated way to store metadata from the .csv file.
Which combination of steps should be taken to meet these requirements with the LEAST amount of effort?
(Choose three.)

• A. Query the data with Amazon Redshift.
• B. Use Amazon S3 as the persistent metadata store.
• C. Use AWS Glue as the persistent metadata store.
• D. Filter the data through Amazon QuickSight to visualize the data.
• E. Query the data with Amazon Athena.
• F. Filter the data through AWS X-Ray to visualize the data.

Answer: B,D,E

NEW QUESTION # 176
A company is using AWS CodeCommit as its source code repository. After an internal audit, the compliance team mandates that any code change that go into the master branch must be committed by senior developers.
Which solution will meet these requirements?

• A. Create two repositories in CodeCommit: one for working and another for the master. Create separate IAM groups for senior developers and developers. Assign the resource-level permissions on the repositories tied to the IAM groups. After the code changes are reviewed, sync the approved files to the master code commit repository.
• B. Create a repository in CodeCommit with a working and master branch. Create separate IAM groups for senior developers and developers. Use an IAM policy to assign each IAM group their corresponding branches. Once the code is merged to the working branch, senior developers can pull the changes from the working branch to the master branch.
• C. Create a repository in CodeCommit. Create separate IAM groups for senior developers and developers. Assign code commit permissions for both groups, with code merge permissions for the senior developers group. Create a trigger to notify senior developers with a URL link to approve or deny commit requests delivered through Amazon SNS. Once a senior developer approves the code, the code gets merged to the master branch.
• D. Create a repository in CodeCommit. Create separate IAM groups for senior developers and developers. Use AWS Lambda triggers on the master branch and get the user name of the developer at the event object of the Lambda function. Validate the user name with the IAM group to approve or deny the commit.

Answer: B

NEW QUESTION # 177
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