AWS Certified DevOps Engineer – Professional Practice Questions Part 1

To change the instance type of the production instance which is running as the part of
an auto-scaling group. There are currently four instances running in a group, and the
whole architecture is deployed by using CloudFormation template, and you have to
ensure that there are always two instances running during the updating session without
creating any interruption. Which is the most favorable option below for the scenario?

There is a large multi-tiered Windows-based web application situated behind a load
balancer and running on an EC2 instance. The problem occurs of slow customer page
load time, and the manager asks you to sort out this problem and ensure that customer
load time is not affected by too many requests per second. Which one of the following
techniques solves this problem?

Amazon SQS queue is processing messages of an auto-scaling group instance. This
processing involves calling third-party web services. The third-party complaints of
failed and repeated calls it is receiving from you. During the inspection, it is seen that instances are terminated when the group scales-in. What could be the possible solution
to reduce the number of incomplete process attempts?

There is a company that has different applications built on different programming
languages. How can the application be built as quickly as possible in this case?

To do live debugging of a highly secure environment, the development team wants
account- level access to the production instance. What should be done?

For the deployment of the application, you have used CloudFormation instead of
OpsWorks and the Elastic BeanStalk. But this resource system is not supported by
CloudFormation. What would you do now?

To store credentials on Amazon EC2 instances for connecting to an Amazon RDS
MYSQL database instance. How can these credentials be securely stored?

Which is the first transition state an instance enter after leaving the steady state due to
health check failure or decreased load?

There is an application which is currently running on EC2 instance behind a load
balancer, and now the management decides to deploy the application on blue/ green
deployment strategy. How can you deploy the application?

he management is concerned with the extreme increasing cost as management has
reported the increase in monthly bills. After reviewing the billing report, it is noticed
that there is an increase in data transfer cost. Now how can you provide management
with better insight into data transfer use?

To maintain version control and achieve automation for the application in your
organization, you are requested to use CloudFormation. To keep everything agile and
maintain while reducing the cost how you can use CloudFormation?

To change the current alarm threshold defined in the CloudWatch alarm in a
CloudFormation template defined in AWS. How can you achieve this?

When an EC2 instance is running in an auto-scaling group, the application rapidly
scales up or down in response to load. However, after the load peaks, the problem starts
in the configuration management system where previously terminated EC2 instance is
still active. What is the reliable and efficient way o handle the EC2 resources within the
configuration management system? (Choose 2)

In this scenario, there is an EC2 instance running on the auto-scaling group. In this, the
instances are bootstrapped dynamically and take 15 minutes to complete bootstrapping. Auto-scaling reports that instances are being in services as before the completion of
bootstrapping and application alarms for new instances also generated before the
completion of bootstrapping which creates confusion. The cause is that the application
monitoring tool is pooling the auto-scaling service API for instances that are in service
and creating an alarm for previously unknown instances. Which one of the following
ensures that new instances are not added in application monitoring tool before the
bootstrapping?

You are using Docker to get high consistency between staging and application for the
application in EC2 instance, but you are asked for de-risk deployment at the company.
How do you further de-risk the rest of the execution environment?

You are using chef in your datacenter. Which service is designed to let the customer
leverage existing chef recipes in AWS?

There is a recently deployed application on EC2 instances behind ELB and customers
start complaining about errors received from the application. You have to diagnose the
error, but the problem is that the ELB access logs are empty. What would be the reason?

Currently, an infrastructure is running on EC2 instance behind an auto-scaling group.
The application logs are written on ephemeral storage. The company experienced a
major bug which triggered the auto-scaling group up and down before successfully
retrieve the logs of the server. What technique is suitable to retrieve logs after the
instance’s shutdown?

While testing Amazon RDS MySQL database, CPU utilization hit 100% and make the
system non-responsive. The application is read-heavy. What are the methods which can
scale the data tiers in order the meet the application needs? (Choose 3)

n case of the continuous deployment process, the application using new AMI’s
undergoes an I/O performance test before deploying to production. The application
utilizes one EBS PIOPS volume per instance and requires consistent I/O performance.
Which of the following yield the correct result in a repeatable manner for I/O
performance test?

There is a large number of web servers in an auto-scaling group behind the load
balancer. Hourly, you need to filter and process the data and put it back in the durable
data store to run reports. The Auto-scaling group continuously launches or terminates
the web servers according to the scaling policies assigned to them, but you do not want
to lose any access log during this launching and termination. What are the two
approaches to meet the demand? (Choose 2)

To implement blue/green deployment for several multi-tier web application having
infrastructure EC2 front end server, Amazon ElastiCache clusters, Amazon SQS queues,
and Amazon relational database instance. Which service combination gives the ability
to control traffic between the different deployed version of the application?

To create Route53 records automatically in CloudFormation during all launches of a
template when not running in production. How can this be implemented?

You are using IAM roles to access AWS API’s, and an application is running on an EC2
instance. How can you configure your application running on that instance to retrieve
the API keys for use with the AWS SDK’s?

To protect information that your application is stored on an EBS volume attached to
the EC2 instance. How can you make this sensitive information secure?

In a project, you are working on a single AWS CloudFormation template to deploy
AWS infrastructure which supports multi-tier web application. You have to maintain
the AWS CloudFormation resource in such a way that the departments such as
networking and security can review the architecture before it goes to production. How
can you accommodate each department and maintain the resource?

What services can Elastic BeanStalk perform for you, when your application takes a long
time to run?

For the primary monitoring of a web application, CloudWatch is used. After recent
deployment of software, 500 internal server occurs on the web application. You need to
create a CloudWatch alarm which notifies on-call engineer when these errors occur.
How can you accomplish this using AWS services? (Choose 3)

A company develops a variety of web applications using different platform and
programming languages with different application dependencies. Each application
must be developed and deployed quickly and must be highly available all the time in
order to satisfy the business. What methods are used for this purpose?

You have deployed Elastic BeanStalk in a new application without losing the current
state of the environment in a document. You want to make sure that you can restore
the current state later or possibly can create a new environment. You have to make a
restoring point. What should be your strategy?

To design a system, which needs at least 8 m4.large instances to operate service traffic.
When a system with high availability in the us-east-1 region which has 6 availability
zone is designing, your company needs to ne able to handle the full death of the
availability zone. How can you distribute the servers to minimize the cost, while
assuming all EC2 nodes are linked with ELB. VPC account can utilize us-east-1’s
availability zone a through f, inclusively.

In AWS CloudFormation, this is not an intrinsic function?

EC2 instances are running behind an ELB in AWS setup. And you have to monitor the
incoming connections of ELB. Which is the best option for this purpose?

You have to set up some applications in AWS. A web tier hosted on EC2 instances,
Session data to be written on DynamoDB, Logfiles to be written to Microsoft SQL
server. How can you allow an application to write data to DynamoDB table?

An E-Commerce store is managed by using Elastic BeanStalk, and the store is the opensource e-commerce platform and deployed across multiple instances in an auto-scaling
group. Development team creates a new extension for the store which is PHP source code as well as SQL upgrade script which is used to make necessary updates in the
database schema. Some of the extensions deployment fails while SQL upgrade system
due to some errors. This is because SQL script is being executed on Amazon EC2
instances. You have to make sure that the SQL script only executed once per
deployment regardless of instances running at that time. How can you achieve this?

In an auto-scaling group health check, one of the instances returns to the status of
impaired to auto-scaling. What will auto-scale do?

There is a set of EC2 instances hosted on AWS. You create a role named DemoRole and
assigned that role to a policy, but you are unable to use that role with any instance.
What is the reason?

To monitor specific applications and send real-time alerts to DevOps Engineer which
service is the best to fulfill this requirement?

You want to migrate your applications to the cloud, and you want to migrate gradually
so that application is tested with a small percentage of the user. It will be increased over
time. What is the required implementation?

For video game scores, you are creating a new API. In this case, reads are 100 times
better than writes, and the 1% of scores are read 100 times more faster than the rest of
the scores. Using DynamoDB what is the best suitable design for this system?

There is an application which consists of EC2 instance in an auto-scaling group. During
a particular time frame, users complaining about the poor response time of application
due to the increase in traffic. You have to deploy new EC2 instance for an auto-scaling group when utilization of CPU is greater than 60% for 2 consecutive periods of 5
minutes. What is the way to solve this problem?

Multiple applications are running on AWS. The company wants you to develop a tool
that immediately calls the team when the alarm is triggered. You also have to make sure
that alarm for on-call team generated must handle to notify correct team at the correct
time. How can this be implemented?

You are a DevOps engineer in a company, and you are requested to create a rolling
deployment solution with minimal downtime and cost-effective. How can you achieve
this? (Choose 2)

Which of the configuration files can be used to deploy Docker containers as an Elastic
BeanStalk application as you want to deploy multi docker environment to AWS?

Elastic Load Balancing HTTP health check is enabled. In AWS management console all
the instance pass through health checks but customer reports that your site is not
responding. What will be the reason?

Elastic BeanStalk is using to manage the plications. There is an SQL script that only
needs to be executed at once per deployment no matter how many instances are
running. How can you achieve this?

The company developed a web application and hosted it in Amazon S3 bucket
configured for static website hosting. The application using AWS SDK for JavaScript in
the browser to access the data stored in the DynamoDB table. How can you secure API
keys which access data from DynamoDB table?

You are hired as the new head of operation of SaaS company, and your CTO has asked
you to make debugging. The CTO complains that there is no idea what is going on in
the complex, service-oriented architecture because it is very difficult to find the errors
in the logs and other services too as a developer just log in to disk. How can you satisfy
the CTO?

You have a setup in AWS that contains an elastic load balancer, an auto-scaling group
which launches EC2 instances and AMI’s with your code pre-installed. You want a costeffective solution and deploy the updates up to a certain number of users and able to
revert quickly. What is the best approach?

While analyzing the metrics, you got to know that the company website is experiencing
response time higher than the anticipated during peak hours. You rely on auto-scaling
to make sure you are scaling your time during peak windows. How can you enhance
your auto-scaling policy to decrease the response time which is high?