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>> AWS-DevOps-Engineer-Professional Vorbereitungsfragen <<
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186. Frage
You are in charge of designing a number of Cloudformation templates for your organization. You are required to make changes to stack resources every now and then based on the requirement. How can you check the impact of the change to resources in a cloudformation stack before deploying changes to the stack?
Antwort: A
Begründung:
Explanation
The AWS Documentation mentions
When you need to update a stack, understanding how your changes will affect running resources before you implement them can help you update stacks with confidence. Change sets allow you to preview how proposed changes to a stack might impact your running resources, for example, whether your changes will delete or replace any critical resources, AWS CloudFormation makes the changes to your stack only when you decide to execute the change set, allowing you to decide whether to proceed with your proposed changes or explore other changes by creating another change set. You can create and manage change sets using the AWS CloudFormation console, AWS CLI, or AWS CloudFormation API.
For more information on Cloudformation change sets, please visit the below url
http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets.html
187. Frage
A Development team is currently using AWS CodeDeploy to deploy an application revision to an Auto Scaling group. If the deployment process fails, it must be rolled back automatically and a notification must be sent.
What is the MOST effective configuration that can satisfy all of the requirements?
Antwort: B
188. Frage
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?
Antwort: C
Begründung:
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.
189. Frage
What are the benefits when you implement a Blue Green deployment for your infrastructure or application level changes. Choose 3 answers from the options given below
Antwort: A,C,D
Begründung:
Explanation
The AWS Documentation mentions the following
Blue/green deployments provide near zero-downtime release and rollback capabilities. The fundamental idea behind blue/green deployment is to shift traffic between two identical environments that are running different versions of your application. The blue environment represents the current application version serving production traffic. In parallel, the green environment is staged running a different version of your application.
After the green environment is ready and tested, production traffic is redirected from blue to green.
For more information on Blue Green deployments please see the below link:
* https://dOawsstatic.com/whitepapers/AWSBlueGreen_Deployments.pdf
190. Frage
You need to store a large volume of data. The data needs to be readily accessible for a short period, but then needs to be archived indefinitely after that. What is a cost-effective solution?
Antwort: B
Begründung:
Explanation
The AWS documentation mentions the following on Lifecycle policies
Lifecycle configuration enables you to specify the lifecycle management of objects in a bucket. The configuration is a set of one or more rules, where each rule defines an action for Amazon S3 to apply to a group of objects. These actions can be classified as follows:
Transition actions - In which you define when objects transition to another storage class. For example, you may choose to transition objects to the STANDARDJ A (IA, for infrequent access) storage class 30 days after creation, or archive objects to the GLACIER storage class one year after creation.
Expiration actions - In which you specify when the objects expire. Then Amazon S3 deletes the expired objects on your behalf. For more information on S3 Lifecycle policies, please visit the below URL
* http://docs.aws.amazon.com/AmazonS3/latest/dev/object-lifecycle-mgmt.html
191. Frage
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