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The AWS-DevOps certification exam covers a wide range of topics, including continuous delivery and deployment, monitoring and logging, security, and compliance. DOP-C01 Exam also tests candidates' knowledge of AWS services such as AWS Elastic Beanstalk, AWS CloudFormation, AWS CodeDeploy, and AWS CodePipeline. To pass the AWS-DevOps certification exam, candidates must score at least 75%.

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q291-Q296):

NEW QUESTION # 291
You are creating a new API for video game scores. Reads are 100 times more common than writes, and the top 1% of scores are read 100 times more frequently than the rest of the scores.
What's the best design for this system, using DynamoDB?

A. DynamoDB table with 100x higher read than write throughput, with ElastiCache caching.
B. DynamoDB table with roughly equal read and write throughput, with ElastiCache caching.
C. DynamoDB table with 100x higher read than write throughput, with CloudFront caching.
D. DynamoDB table with roughly equal read and write throughput, with CloudFront caching.

Answer: B

Explanation:
Because the 100x read ratio is mostly driven by a small subset, with caching, only a roughly equal number of reads to writes will miss the cache, since the supermajority will hit the top 1% scores. Knowing we need to set the values roughly equal when using caching, we select AWS ElastiCache, because CloudFront cannot directly cache DynamoDB queries, and ElastiCache is an excellent in-memory cache for database queries, rather than a distributed proxy cache for content delivery. ... One solution would be to cache these reads at the application layer. Caching is a technique that is used in many high-throughput applications, offloading read activity on hot items to the cache rather than to the database. Your application can cache the most popular items in memory, or use a product such as ElastiCache to do the same.
Reference:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/best-practices.html#%20Guideli%
20nesForTables.CachePopularItem

NEW QUESTION # 292
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. Update the CodeBuild project role with the necessary permissions and then remove the AWS credentials from the environment variable.
B. Use AWS Systems Manager run command versus scp and ssh commands directly to the instance.
C. Scramble the environment variables using XOR followed by Base64, add a section to install, and then run XOR and Base64 to the build phase.
D. Store the DB_PASSWORD as a SecurityString value in AWS Systems Manager Parameter Store and then remove the DB_PASSWORD from the environment variables.
E. 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.
F. Move the environment variables to the 'db-deploy-bucket' Amazon S3 bucket, add a prebuild stage to download, then export the variables.

Answer: B,E,F

NEW QUESTION # 293
Your company currently runs a large multi-tier web application. One component is an API service that all other components of your application rely on to perform read/write operations.
This service must have high availability and zero downtime during deployments.
Which technique should you use to provide cost-effective, zero-downtime deployments for this component?

A. Re-deploy your application behind a load balancer using an AWS OpsWorks stack and use AWS OpsWorks stack versioning, during deployment create a new version of your application, tell AWS OpsWorks to launch the new version behind your load balancer, and when the new version is launched, terminate the old AWS OpsWorks stack.
B. Re-deploy your application on Elastic Beanstalk. During deployment, create a new version of your application, and create a new environment running that version in Elastic BeanStalk. Finally, take advantage of the Elastic Beanstalk Swap CNAME operation to switch to the new environment.
C. Re-deploy your application behind a load balancer that uses Auto Scaling groups. Create a new identical Auto Scaling group and associate it to your Amazon Route53 zone.
Configure Amazon Route53 to auto- weight traffic over to the new Auto Scaling group when all instances are marked as healthy.
D. Use an AWS CloudFormation template to re-deploy your application behind a load balancer, and launch a new AWS CloudFormation stack during each deployment.
Update your load balancer to send traffic to the new stack, and then deploy your software. Leave your old stacks running, and tag their resources with the version for rollback.

Answer: B

NEW QUESTION # 294
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?

A. Replace 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.
B. Create 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.
C. Associate 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.
D. Assign 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.

Answer: B

NEW QUESTION # 295
You are planning on using the Amazon RDS facility for Fault tolerance for your application. How does
Amazon RDSmuIti Availability Zone model work

A. A second, standby database is deployed and maintained in a different availability zone from master
using asynchronous replication.
B. A second, standby database is deployed and maintained in a different region from master using
synchronous replication.
C. A second, standby database is deployed and maintained in a different region from master using
asynchronous replication.
D. A second, standby database is deployed and maintained in a different availability zone from master,
using synchronous replication.

Answer: D

Explanation:
Explanation
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.
The below diagram from the AWS documentation shows how this is configured

Option B is invalid because the replication is synchronous.
Option C and D are invalid because this is built around AZ and not regions.
For more information on Multi-AZ RDS, please visit the below URL:
* https://aws.amazon.com/rds/details/multi-az/

NEW QUESTION # 296
......

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q291-Q296):

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