Exam 12: AWS DevOps Engineer - Professional (DOP-C01)

You work for a startup that has developed a new photo-sharing application for mobile devices. Over recent months, your application has increased in popularity; this has resulted in a decrease in the performance of the application clue to the increased load. Your application has a two-tier architecture that is composed of an Auto Scaling PHP application tier and a MySQL RDS instance initially deployed with AWS CloudFormation. Your Auto Scaling group has a min value of 4 and a max value of 8. The desired capacity is now at 8 because of the high CPU utilization of the instances. After some analysis, you are confident that the performance issues stem from a constraint in CPU capacity, although memory utilization remains low. You therefore decide to move from the general-purpose M3 instances to the compute-optimized C3 instances. How would you deploy this change while minimizing any interruption to your end users?

A company must collect user consent to a privacy agreement. The company deploys an application in six AWS Regions: two Regions in North America, two Regions in Europe, and two Regions in Asia. The application has a user base of 20 million to 30 million users. The company needs to read and write data that is related to each user's response. The company also must ensure that the responses are available in all six Regions. Which solution will meet these requirements with the LOWEST latency of reads and writes?

An application that runs on Amazon EC2 instances behind an Application Load Balancer is deployed using AWS Elastic Beanstalk. During a recent rolling deployment, users experienced application errors even though application health checks were passing on all instances. A log analysis shows that the errors were caused by user requests being processed by two different versions of the application behind the same load balancer. The analysis also shows a recent change made the responses backward incompatible. Which deployment method will address these issues?

A company is developing a web application's infrastructure using AWS CloudFormation. The database engineering team maintains the database resources in a CloudFormation template, and the software development team maintains the web application resources in a separate CloudFormation template. As the scope of the application grows, the software development team needs to use resources maintained by the database engineering team. However, both teams have their own review and lifecycle management processes that they want to keep. Both teams also require resource-level change-set reviews. The software development team would like to deploy changes to this template using their CI/CD pipeline. Which solution will meet these requirements?

You manage a web advertising platform on a single AWS account. This platform produces realtime ad-click data that you store as objects in an Amazon S3 bucket called "dick-data." Your advertising partners want to use Amazon Elastic MapReduce in their own AWS accounts to do analytics on the ad-click data. They have asked for immediate access to the ad-dick data so that they can run analytics. Which two choices are required to facilitate secure access to this data? (Choose two.)

A company is migrating an application to AWS that runs on a single Amazon EC2 instance. Because of licensing limitations, the application does not support horizontal scaling. The application will be using Amazon Aurora for its database. How can the DevOps Engineer architect automated healing to automatically recover from EC2 and Aurora failures, in addition to recovering across Availability Zones (AZs), in the MOST cost-effective manner?

An application running on multiple Amazon EC2 instances pulls messages from a standard Amazon SQS queue. A requirement for the application is that all messages must be encrypted at rest. Developers are instructed to use methods that allow for centralized key management and minimize possible support requirements whenever possible. Which of the following solutions supports these requirements?

You need to perform ad-hoc analysis on log data, including searching quickly for specific error codes and reference numbers. Which should you evaluate first?

A DevOps Engineer administers an application that manages video files for a video production company. The application runs on Amazon EC2 instances behind an ELB Application Load Balancer. The instances run in an Auto Scaling group across multiple Availability Zones. Data is stored in an Amazon RDS PostgreSQL Multi-AZ DB instance, and the video files are stored in an Amazon S3 bucket. On a typical day, 50 GB of new video are added to the S3 bucket. The Engineer must implement a multi-region disaster recovery plan with the least data loss and the lowest recovery times. The current application infrastructure is already described using AWS CloudFormation. Which deployment option should the Engineer choose to meet the uptime and recovery objectives for the system?

You are building a game high score table in DynamoDB. You will store each user's highest score for each game, with many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the highest score for any game. What is the best DynamoDB key structure?

A root owner is trying to create an IAM user of the various departments. The owner has created groups for each department, but wants to still delineate the user based on the sub division level. E.g. The two users from different sub departments should be identified separately and have separate permissions. How can the root owner configure this?

A company is deploying a new mobile game on AWS for its customers around the world. The Development team uses AWS Code services and must meet the following requirements: - Clients need to send/receive real-time playing data from the backend frequently and with minimal latency - Game data must meet the data residency requirement Which strategy can a DevOps Engineer implement to meet their needs?

A company is using AWS CodeDeploy to automate software deployment. The deployment must meet these requirements: A number of instances must be available to serve traffic during the deployment. Traffic must be balanced across those instances, and the instances must automatically heal in the event of failure. A new fleet of instances must be launched for deploying a new revision automatically, with no manual provisioning. Traffic must be rerouted to the new environment to half of the new instances at a time. The deployment should succeed if traffic is rerouted to at least half of the instances; otherwise, it should fail. Before routing traffic to the new fleet of instances, the temporary files generated during the deployment process must be deleted. At the end of a successful deployment, the original instances in the deployment group must be deleted immediately to reduce costs. How can a DevOps Engineer meet these requirements?

A web application has been deployed using an AWS Elastic Beanstalk application. The Application Developers are concerned that they are seeing high latency in two different areas of the application: HTTP client requests to a third-party API MySQL client library queries to an Amazon RDS database A DevOps Engineer must gather trace data to diagnose the issues. Which steps will gather the trace information with the LEAST amount of changes and performance impacts to the application?

You run a small online consignment marketplace. Interested sellers complete an online application in order to allow them to sell their products on your website. Once approved, they can post their product using a custom interface. From that pant, you manage the shopping cart process so that when a buyer decides to buy a product, you handle the billing and coordinate the shipping. Part of this process requires sending emails to the buyer and the seller at different stages. Your system has been running on AWS for a few months. Occasionally, products are shipped before payment cleared and emails are sent out of order. Furthermore, sometimes credit cards are being charged twice. How can you resolve these problems?

You currently have the following setup in AWS: 1) An Elastic Load Balancer 2) Auto Scaling Group which launches EC2 Instances 3) AMIs with your code pre-installed You want to deploy the updates of your app to only a certain number of users. You want to have a cost-effective solution. You should also be able to revert back quickly. Which of the below solutions is the most feasible one?

A company has an application that has predictable peak traffic times. The company wants the application instances to scale up only during the peak times. The application stores state in Amazon DynamoDB. The application environment uses a standard Node.js application stack and custom Chef recipes stored in a private Git repository. Which solution is MOST cost-effective and requires the LEAST amount of management overhead when performing rolling updates of the application environment?

A company is implementing an Amazon ECS cluster to run its workload. The company architecture will run multiple ECS services on the cluster, with an Application Load Balancer on the front end, using multiple target groups to route traffic. The Application Development team has been struggling to collect logs that must be collected and sent to an Amazon S3 bucket for near-real time analysis What must the DevOps Engineer configure in the deployment to meet these requirements? (Select THREE)

A DevOps Engineer is launching a new application that will be deployed on infrastructure using Amazon Route 53, an Application Load Balancer, Auto Scaling, and Amazon DynamoDB. One of the key requirements of this launch is that the application must be able to scale to meet a load increase. During periods of low usage, the infrastructure components must scale down to optimize cost. What steps can the DevOps Engineer take to meet the requirements? (Choose two.)

You recently encountered a major bug in your Windows-based web application during a deployment cycle. During this failed deployment, it took the team four hours to roll back to a previously working state, which left customers with a poor user experience. During the post-mortem, your team discussed the need to provide a quicker way to roll back failed deployments. You currently run your web application on Amazon EC2 using Windows 2012R2 and use Elastic Load Balancing for your load balancing needs. Which technique should you use to solve this problem?