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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q555-Q560):

NEW QUESTION # 555
You have an application which consists of EC2 instances in an Auto Scaling group. Between a particular time frame every day, there is an increase in traffic to your website.
Hence users are complaining of a poor response time on the application. You have configured your Auto Scaling group to deploy one new EC2 instance when CPU utilization is greater than
60% for 2 consecutive periods of 5 minutes.
What is the least cost-effective way to resolve this problem?

A. Decrease the threshold CPU utilization percentage at which to deploy a new instance
B. Decrease the consecutive number of collection periods
C. Increase the minimum number of instances in the Auto Scaling group
D. Decrease the collection period to ten minutes

Answer: C

Explanation:
If you increase the minimum number of instances, then they will be running even though the load is not high on the website. Hence you are incurring cost even though there is no need. All of the remaining options are possible options which can be used to increase the number of instances on a high load.
For more information on On-demand scaling, please refer to the below link:
http://docs.aws.amazon.com/autoscaling/latest/userguide/as-scale-based-on-demand. html Note: The tricky part where the question is asking for 'least cost effective way". You got the design consideration correctly but need to be careful on how the question is phrased.

NEW QUESTION # 556
When you add lifecycle hooks to an Autoscaling Group, what are the wait states that occur during the scale in
and scale out process. Choose 2 answers from the options given below

A. Terminating:Wait
B. Launching:Wait
C. Pending:Wait
D. Exiting:Wait

Answer: A,C

Explanation:
Explanation
The AWS Documentation mentions the following
After you add lifecycle hooks to your Auto Scaling group, they work as follows:
1. Auto Scaling responds to scale out events by launching instances and scale in events by terminating
instances.
2. Auto Scaling puts the instance into a wait state (Pending:Wait orTerminating: Wait). The instance is paused
until either you tell Auto Scaling to continue or the timeout period ends.
For more information on Autoscaling Lifecycle hooks, please visit the below URL: * http://docs.aws.a
mazon.com/autoscaling/latest/userguide/lifecycle-hooks.htm I

NEW QUESTION # 557
You're responsible for a popular file sharing application that uses Elastic Load Balancing to distribute traffic to an Amazon EC2 application tier deployed in an Auto Scaling group that runs across multiple Availability Zones.
You currently record the number of user file transfers to a log file on the application server, and then write data points from the logs to an Amazon RDS MySQL instance.
You aren't happy with how your application scales, and want to implement a new scaling policy based on the average number of user file transfers in a 10-minute period instead of average CPU utilization in the last five minutes.
What steps should you take to ensure that your application tier scales based on this new policy?
Choose 2 answers

A. Create a new CloudWatch alarm based on the Elastic Load Balancing "RequestCount" metric that triggers an Auto Scaling action to scale the application tier.
B. Create a new Auto Scaling launch configuration that includes an Amazon EC2 user data script that installs a CloudWatch Logs Agent on newly launched instances in the application tier. The agent will be configured to stream the file transfers log tile to CloudWatch.
C. Create a new Auto Scaling launch configuration for the application tier that scales based on an Auto Scaling policy that reads the file transfer log data from the Amazon RIDS MySQL instance.
D. Create a new CloudWatch alarm based on a custom metric published from file transfer logs streaming to CloudWatch that triggers an Auto Scaling action to scale the application tier.
E. Create a new Auto Scaling launch configuration that includes an Amazon EC2 user data script that installs an Amazon RDS Logs Agent on newly launched instances in the application tier. The agent will be configured to stream the file transfer data points to the Auto Scaling group.
F. Create a new CloudWatch alarm based on a custom metric streaming from the Amazon RDS MySQL instance that triggers an Auto Scaling action to scale the application tier.

Answer: B,D

NEW QUESTION # 558
Of the 6 available sections on a Cloud Formation template (Template Description Declaration, Template Format Version Declaration, Parameters, Resources, Mappings, Outputs), which is the only one required for a CloudFormation template to be accepted? Choose an answer from the options below

A. Resources
B. Mappings
C. Parameters
D. Template Declaration

Answer: A

Explanation:
Explanation
If you refer to the documentation, you will see that Resources is the only mandatory field Specifies the stack resources and their properties, such as an Amazon Elastic Compute Cloud instance or an Amazon Simple Storage Service bucket.
For more information on cloudformation templates, please refer to the below link:
* http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/template-anatomy.html

NEW QUESTION # 559
Which status represents a failure state in AWS CloudFormation?

A. <code>ROLLBACK_IN_PROGRESS</code>
B. <code>ROLLBACK_FAILED</code>
C. <code>UPDATE_COMPLETE_CLEANUP_IN_PROGRESS</code>
D. <code>DELETE_COMPLETE_WITH_ARTIFACTS</code>

Answer: A

Explanation:
ROLLBACK_IN_PROGRESS means an UpdateStack operation failed and the stack is in the process of trying to return to the valid, pre-update state.
UPDATE_COMPLETE_CLEANUP_IN_PROGRESS means an update was successful, and CloudFormation is deleting any replaced, no longer used resources. ROLLBACK_FAILED is not a CloudFormation state (but UPDATE_ROLLBACK_FAILED is).
DELETE_COMPLETE_WITH_ARTIFACTS does not exist at all.
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating- stacks.html

NEW QUESTION # 560
......

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