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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q443-Q448):

NEW QUESTION # 443
Which of these is not a CloudFormation Helper Script?

A. cfn-request
B. cfn-signal
C. cfn-get-metadata
D. cfn-hup

Answer: A

Explanation:
This is the complete list of CloudFormation Helper Scripts: cfn-init, cfn-signal, cfn-get-metadata, cfn-hup
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-helper-scripts- reference.html

NEW QUESTION # 444
A Developer is maintaining a fleet of 50 Amazon EC2 Linux servers. The servers are part of an Amazon EC2 Auto Scaling group, and also use Elastic Load Balancing for load balancing.
Occasionally, some application servers are being terminated after failing ELB HTTP health checks. The Developer would like to perform a root cause analysis on the issue, but before being able to access application logs, the server is terminated.
How can log collection be automated?

A. Use Auto Scaling lifecycle hooks to put instances in a Terminating:Wait state. Create an Amazon CloudWatch subscription filter for EC2 Instance and trigger a CloudWatch agent that executes a script to called logs, push them to Amazon S3, and complete the lifecycle action Terminate Successful once logs are collected.
B. Use Auto Scaling lifecycle hooks to put instances in a Pending:Wait state. Create an Amazon CloudWatch Alarm for EC2 Instance Terminate and trigger an AWS Lambda function that executes an SSM Run Command script to collect logs, push them to Amazon S3, and complete the Successful lifecycle action once logs are collected.
C. Use Auto Scaling lifecycle hooks to put instances in a Terminating:Wait state. Create a Config rule for EC2 Instance-terminate Lifecycle and trigger a step function that executes a script to collect logs, push them to Amazon S3, and complete the lifecycle action once logs are collected. Action
D. Use Auto Scaling lifecycle hooks to put instances in a Terminating:Wait state. Create an Amazon CloudWatch Events rule for EC2 Instance- and trigger an AWS Lambda function that executes a SSM Run Command script to collect logs, push them to Amazon S3, terminate Lifecycle Action and complete the lifecycle action once logs are collected.

Answer: D

Explanation:
Explanation
https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks.html

NEW QUESTION # 445
Your company is getting ready to do a major public announcement of a social media site on AWS. The
website is running on EC2 instances deployed across multiple Availability Zones with a Multi-AZ RDS
MySQL Extra Large DB Instance. The site performs a high number of small reads and writes per second and
relies on an eventual consistency model. After comprehensive tests you discover that there is read contention
on RDS MySQL. Which are the best approaches to meet these requirements?
Choose 2 answers from the options below

A. Implementshardingto distribute load to multiple RDS MySQL instances
B. Increasethe RDS MySQL Instance size and Implement provisioned IOPS
C. Addan RDS MySQL read replica in each availability zone
D. DeployElasticCache in-memory cache running in each availability zone

Answer: C,D

Explanation:
Explanation
Implement Read Replicas and Elastic Cache
Amazon RDS Read Replicas provide enhanced performance and durability for database (DB) instances. This
replication feature makes it easy to elastically scale out beyond the capacity constraints of a single DB
Instance for read-heavy database workloads. You can create one or more replicas of a given source DB
Instance and
serve high-volume application read traffic from multiple copies of your data, thereby increasing aggregate read
throughput.
For more information on Read Replica's, please visit the below link
* https://aws.amazon.com/rds/details/read-replicas/
Amazon OastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory data store
or cache in the cloud. The service improves the performance of web applications by allowing you to retrieve
information from fast, managed, in-memory data stores, instead of relying entirely on slower disk-based
databases.
For more information on Amazon OastiCache, please visit the below link
* https://aws.amazon.com/elasticache/

NEW QUESTION # 446
Which of the following CLI commands is used to spin up new EC2 Instances?

A. awsec2 new-instances
D- awsec2 launch-instances
B. awsec2 run-instances
B- awsec2 create-instances

Answer: B

Explanation:
Explanation
The AWS Documentation mentions the following
Launches the specified number of instances using an AMI for which you have permissions.
You can specify a number of options, or leave the default options. The following rules apply:
* [EC2-VPC] If you don't specify a subnet ID. we choose a default subnet from your default VPC for you.
If you don't have a default VPC, you must specify a subnet ID in the request.
* [EC2-Classic] If don't specify an Availability Zone, we choose one for you.
* Some instance types must be launched into a VPC. if you do not have a default VPC. or if you do not specify a subnet ID. the request fails. For more information, see Instance Types Available Only in a VPC.
* [EC2-VPC] All instances have a network interface with a primary private IPv4 address. If you don't specify this address, we choose one from the IPv4 range of your subnet.
* Not all instance types support IPv6 addresses. For more information, see Instance Types.
* If you don't specify a security group ID, we use the default security group. For more information, see Security Groups.
* If any of the AMIs have a product code attached for which the user has not subscribed, the request fails.
For more information on the Cc2 run instance command please refer to the below link
* http://docs.aws.a
mazon.com/cli/latest/reference/ec2/run -instances.html

NEW QUESTION # 447
You are the IT administrator for your company. You have the responsibility of creating development
environments which would confirm to the LAMP development stack. The requirement is that the development
team always gets the latest version of the LAMP stack each time a new instance is launched. Which of the
following is an efficient and effective way to implement this requirement? Choose 2 answers from the options
given below

A. Create an AMI with all the artifacts of the LAMP stack and provide an instance to the development team
based on the AMI.
B. Use the User data section and use a custom script which will be used to download the necessary LAMP
stack packages.
C. Create an EBS Volume with the LAMP stack and attach it to an instance whenever it is required.
D. Create a cloudformation template and use the cloud-init directives to download and the install the
LAMP stack packages.

Answer: B,D

Explanation:
Explanation
Using User data and cloud-init directives you can always ensure you download the latest version of the LAMP
stack and give it to the development teams. With AMI's
you will always have the same version and will need to create an AMI everytime the version of the LAMP
stack changes.
The AWS Documentation mentions
When you launch an instance in Amazon CC2, you have the option of passing user data to the instance that
can be used to perform common automated
configuration tasks and even run scripts after the instance starts. You can pass two types of user data to
Amazon CC2: shell scripts and cloud-init directives. You can
also pass this data into the launch wizard as plain text, as a file (this is useful for launching instances using the
command line tools), or as base64-encoded text (for
API calls).
For more information on User data please refer to the below link:
* http://docs.aws.amazon.com/AWSCC2/latest/UserGuide/user-data.
html

NEW QUESTION # 448
......

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