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Download AWS Certified DevOps Engineer - Professional Exam Dumps
NEW QUESTION 33
Your team wants to begin practicing continuous delivery using CloudFormation, to enable automated builds and deploys of whole, versioned stacks or stack layers. You have a 3-tier, mission-critical system. Which of the following is NOT a best practice for using CloudFormation in a continuous delivery environment?
Answer: A
Explanation:
Putting all resources in one stack is a bad idea, since different tiers have different life cycles and frequencies of change. For additional guidance about organizing your stacks, you can use two common frameworks: a multi- layered architecture and service-oriented architecture (SOA).
Reference: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/ bestpractices.html#organizingstacks
NEW QUESTION 34
You need to deploy a new application version to production. Because the deployment is high-risk, you need to roll the new version out to users over a number of hours, to make sure everything is working correctly. You need to be able to control the proportion of users seeing the new version of the application down to the percentage point. You use ELB and EC2 with Auto Scaling Groups and custom AMIs with your code pre-installed assigned to Launch Configurations. There are no data base-level changes during your deployment. You have been told you cannot spend too much money, so you must not increase the number of EC2 instances much at all during the deployment, but you also need to be able to switch back to the original version of code quickly if something goes wrong. What is the best way to meet these requirements?
Answer: B
Explanation:
Explanation
This is an example of a Blue Green Deployment
You can shift traffic all at once or you can do a weighted distribution. With Amazon Route 53, you can define a percentage of traffic to go to the green environment and gradually update the weights until the green environment carries the full production traffic. A weighted distribution provides the ability to perform canary analysis where a small percentage of production traffic is introduced to a new environment. You can test the new code and monitor for errors, limiting the blast radius if any issues are encountered. It also allows the green environment to scale out to support the full production load if you're using Elastic Load Balancing
For more information on Blue Green Deployments, please visit the below URL:
* https://dOawsstatic.com/whitepapers/AWS_Blue_Green_Deployments.pdf
NEW QUESTION 35
Your CTO thinks your AWS account was hacked. What is the only way to know for certain if there was unauthorized access and what they did, assuming your hackers are very sophisticated AWS engineers and doing everything they can to cover their tracks?
Answer: C
Explanation:
You must use CloudTrail Log File Validation (default or custom implementation), as any other tracking method is subject to forgery in the event of a full account compromise by sophisticated enough hackers. Validated log files are invaluable in security and forensic investigations.
For example, a validated log file enables you to assert positively that the log file itself has not changed, or that particular user credentials performed specific API activity. The CloudTrail log file integrity validation process also lets you know if a log file has been deleted or changed, or assert positively that no log files were delivered to your account during a given period of time.
http://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-log-file-validation-intro.html
NEW QUESTION 36
Your DevOps team is responsible for a multi-tier, Windows-based web application consisting of web servers, Amazon RDS database instances, and a load balancer behind Amazon Route53.
You've been asked by your manager to build a cost-effective rolling deployment solution for this web application.
What method should you use?
Answer: B
NEW QUESTION 37
Your application requires long-term storage for backups and other data that you need to keep readily available but with lower cost. Which S3 storage option should you use?
Answer: B
Explanation:
Explanation
The AWS Documentation mentions the following
Amazon S3 Standard - Infrequent Access (Standard - IA) is an Amazon S3 storage class for data that is accessed less frequently, but requires rapid access when needed. Standard - IA offers the high durability, throughput, and low latency of Amazon S3 Standard, with a low per GB storage price and per GB retrieval fee.
For more information on S3 Storage classes, please visit the below URL:
* https://aws.amazon.com/s3/storage-classes/
NEW QUESTION 38
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