How Many Questions Of AWS-Certified-DevOps-Engineer-Professional Test Engine

This is the ideal use case for AWS CIoudTraiI.
CloudTrai| provides visibility into user actMty by recording API calls made on your account. CIoudTraiI records important information about each API call, including the name of the API, the identity of the caller, the time of the API call, the request parameters, and the response elements returned by the AWS service. This information helps you to track changes made to your AWS resources and to troubleshoot operational issues. CIoudTraiI makes it easier to ensure compliance with internal policies and regulatory standards. Reference: https://aws.amazon.com/CloudtraiI/faqs/

AWS recommends Blue-Green for zero-downtime deploys. Since you use DynamoDB, and neither AWS OpsWorks nor AWS Elastic Beanstalk directly supports DynamoDB, the option selecting CloudFormation and Blue-Green is correct.
You use various strategies to migrate the traffic from your current application stack (blue) to a new version of the application (green). This is a popular technique for deploying applications with zero downtime. The deployment services like AWS Elastic Beanstalk, AWS CIoudFormation, or AWS OpsWorks are particularly useful as they provide a simple way to clone your running application stack. You can set up a
new version of your application (green) by simply cloning current version of the application (blue). Reference: https://d0.awsstatic.com/whitepapers/overview-of-deployment-options-on-aws.pdf

Elastic BeanstaIk's primary mode of operation exactly supports this use case out of the box. It is simpler than all the other options for this question.
With Elastic Beanstalk, you can quickly deploy and manage applications in the AWS cloud without worrying about the infrastructure that runs those applications. AWS Elastic Beanstalk reduces management complexity without restricting choice or control. You simply upload your application, and Elastic Beanstalk automatically handles the details of capacity provisioning, load balancing, scaling, and application health monitoring.
Reference: http://docs.aws.amazon.com/elasticbeanstaIk/Iatest/dg/create_depIoy_Ruby_raiIs.html

You need to design for N+1 redundancy on Availability Zones. ZONE_COUNT = (REQUIRED_INSTANCES / INSTANCE_COUNT_PER_ZONE) + 1. To minimize cost, spread the instances across as many possible zones as you can. By using a though e, you are allocating 5 zones. Using 2 instances, you have 10 total instances. If a single zone fails, you have 4 zones left, with 2 instances each, for a total of 8 instances. By spreading out as much as possible, you have increased cost by only 25% and significantly de-risked an availability zone failure.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.htmI#concepts- regions-availability-zones

The IAM Role must be fine, as if it were broken, NO jobs would be processed since the system would never be able to get any queue messages. The same reasoning applies to the routing table change. The scaling metric is fine, as instance count increased when the queue depth increased due to more messages entering than exiting. Thus, the only reasonable option is that some of the recent messages must be malformed and unprocessable.
Reference:
https://github.com/andrew-templeton/cloudacademy/blob/fca920b45234bbe99cc0e8efb9c65134884dd48 9/questions/null

The message timeout defines how long after a successful receive request SQS waits before allowing jobs to be seen by other components, and proper configuration prevents duplicate processing.
Reference: http://docs.aws.amazon.com/AWSSimpIeQueueService/latest/SQSDeveIoperGuide/MessageLifecycIe.ht ml

Metrics data are available for 2 weeks. If you want to store metrics data beyond that duration, you can retrieve it using our GetMetricStatistics API as well as a number of applications and tools offered by AWS partners.
Reference: https://aws.amazon.com/cIoudwatch/faqs/

The Elasticsearch and Kibana 4 combination is called the ELK Stack, and is designed specifically for real-time, ad-hoc log analysis and aggregation. All other answers introduce extra delay or require pre-defined queries.
Amazon Elasticsearch Service is a managed service that makes it easy to deploy, operate, and scale Elasticsearch in the AWS Cloud. Elasticsearch is a popular open-source search and analytics engine for use cases such as log analytics, real-time application monitoring, and click stream analytics. Reference: https://aws.amazon.com/elasticsearch-service/

You can create a health check that will run into perpetuity using Route53, in one API call, which will ping your service via HTTP every 10 or 30 seconds.
Amazon Route 53 must be able to establish a TCP connection with the endpoint within four seconds. In addition, the endpoint must respond with an HTTP status code of 200 or greater and less than 400 within two seconds after connecting.
Reference:
http://docs.aws.amazon.com/Route53/latest/DeveIoperGuide/dns-failover-determining-health-of-endpoint s.htmI

This is the definition of Unavailable from the EC2 and EBS SLA.
"UnavaiIabIe" and "Unavai|abi|ity" mean... For Amazon EBS, when all of your attached volumes perform zero read write IO, with pending IO in the queue.
Reference: https://aws.amazon.com/ec2/s|a/

A security group is tied to a region and can be assigned only to instances in the same region. You can't enable an instance to communicate with an instance outside its region using security group rules. Traffic
from an instance in another region is seen as WAN bandwidth.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resources.htmI

Since access and storage for games is uniform, and you need to have ordering within each game for the scores (to access the highest value), your hash (partition) key should be the GameID, and there should be a range key for HighestScore.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GuideIinesForTabIes.htmI#GuideIi nesForTabIes.Partitions

One benefit of long polling with Amazon SQS is the reduction of the number of empty responses, when there are no messages available to return, in reply to a ReceiveMessage request sent to an Amazon SQS queue. Long polling allows the Amazon SQS service to wait until a message is available in the queue before sending a response.
Reference:
http://docs.aws.amazon.com/AWSSimpIeQueueService/latest/SQSDeveIoperGuide/sqs-long-polling.html

Only Weighted Round Robin DNS Records and reverse proxies allow such fine-grained tuning of traffic splits. The Blue-Green option does not meet the requirement that we mitigate costs and keep overall EC2 fileet size consistent, so we must select the 2 ELB and ASG option with WRR DNS tuning. This method is called A/B deployment and/or Canary deployment.
Reference: https://d0.awsstatic.com/whitepapers/overview-of-deployment-options-on-aws.pdf

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 CIoudFormation is deleting any replaced, no longer used resources. ROLLBACK_FA|LED is not a CloudFormation state (but UPDATE_ROLLBACK_FAILED is). DELETE_COMPLETE_W|TH_ART|FACTS does not exist at all.
Reference:
http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/using-cfn-updating-stacks.html

You can put any instance that is in an InService state into a Standby state. This enables you to remove the instance from service, troubleshoot or make changes to it, and then put it back into service. Instances in a Standby state continue to be managed by the Auto Scaling group. However, they are not an active part of your application until you put them back into service.
Reference: http://docs.aws.amazon.com/AutoScaling/latest/DeveIoperGuide/AutoScaIingGroupLifecycIe.html

Snapshots that are taken from encrypted volumes are automatically encrypted. Volumes that are created from encrypted snapshots are also automatically encrypted. Your encrypted volumes and any associated snapshots always remain protected. For more information, see Amazon EBS Encryption.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.htmI

For instances that are collocated inside a placement group, jumbo frames help to achieve the maximum network throughput possible, and they are recommended in this case. For more information, see Placement Groups.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.htm|#jumbo_frame_instances

Use NotificationARNs.member.N when making a CreateStack call to push stack events into SNS in nearly real-time.
Reference:
http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/using-cfn-updating-stacks-monitor-s tack.htmI