Exam Simulator: Refactoring

You are developing an application that uses CloudFront to speed up the distribution of the web content and to keep the content secure while in transit.

Which of the following ways you can use CloudFront to secure and restrict access to content? (Choose all that apply.)

You are building AWS Lambda applications as it makes your Lambda projects portable and enables you to integrate with additional developer tools, such as AWS CodePipeline and AWS CodeBuild.

Which of the following best practices allows you to make a more unit-testable AWS Lambda function?

You have built a community-based app like Reddit that has millions of visitors per month. The tech stack of the app includes NodeJS, React, Redis, Amazon EC2, Amazon S3, Hadoop, Underscore, and MariaDB. Some of the community-members are complaining that the performance of the app is slowing down when the posts have engagement.

Which of the following actions you can follow to resolve the issue as fast as possible with no extra cost?

You are building a distributed peer-to-peer file sharing application that requires low latency and scalability. The app uses a disk-based database, therefore the data retrieval speed from disk plus the added query processing times generally will put your query response times in double-digit millisecond speeds.

Which of the following strategies can improve your overall application performance and reduce your database costs.

You have created a trail to enable continuous delivery of CloudTrail events to an S3 bucket, including events for CloudWatch. The Amazon S3 bucket contains more than 3,500 objects but you need to fetch and return only the first 1,000 objects in the final output without creating pagination.

Which of the following options will you use to run the command aws s3api list-objects to meet the requirement?

You have created an Amazon Kinesis Data Analytics Application that process and analyze streaming data using standard SQL. When Amazon Kinesis Data Analytics inserts a row in the application stream it stores a timestamp.

Which of the following types of times reflects the timestamp that is stored when a record was added to the streaming source?

You are using the extension of AWS Lambda, Lambda@Edge, as it lets you execute functions that customize the content that CloudFront delivers. You have written a Node.js function in one Region, US-East-1 (N. Virginia), and then execute this function in AWS locations globally that are closer to your viewer.

Which of the following CloudFront events have to occur in order to execute the Lambda function? (Choose all that apply.)

You are developing a static code using Lambda functions to automate backups and send the backups to an S3 bucket.

In which of the following Init phases, the Lambda function runs the static code?

You have an existing application that uses standard queues and you want to take advantage of the ordering and exactly-once processing features of FIFO queues.

Which of the following actions needs to be done in order to convert an existing standard queue into a FIFO queue?

You are working on AWS Command Line Interface (AWS CLI) version 1 to list all objects of a given bucket. You have been noticed that when you run list commands on a large number of resources this causes calls to AWS services to exceed the maximum allowed time and generate a “timed out” errors.

What action you can take to resolve this issue?

The AWS account of the ExamsDigest has an ID of 318855545211. The sign-in page URL has the following format https://318855545211.signin.aws.amazon.com/console. We want the URL for our sign-in page to contain our company name (ExamsDigest) instead of the AWS account ID.

Which of the following AWS CLI command will you use to create an alias?

What can you accomplish if you use an ElastiCache for Memcached cluster to store the user session state of the application?

Suppose that you have a large customer base spread across three geographic areas—the US East Coast, the US West Coast, and Western Europe. Customers can update their profile information using your application. To satisfy this use case, you need to create three identical DynamoDB tables named CustomerProfiles, in three different AWS Regions where the customers are located.

What should you do to replicate data changes among these tables without writing your own code?

For compliance purposes, you have been tasked to make sure that all of the new changes made to the items in DynamoDB are recorded and stored on another DynamoDB table in another region.

What should you do in order to complete the task?

You are working with AWS Lambda functions and is considered as a best practice to analyze how long your function runs so that you can better determine any problems with a dependency service that may increase the concurrency of the function beyond what you expect.

What function configuration should you make to determine an optimum timeout value?

After you’ve made your API available to be called, you realize that it needs to be optimized to improve responsiveness. After making your research you end up following the payload compression strategy.

Which of the following AWS CLI command will you use to enable compression on your existing API?

You have been tasked to implement the following scenario. Each time an item in the table is modified and a new record appears in the table’s stream then copy each stream record to persistent storage, such as Amazon Simple Storage Service (Amazon S3), to create a permanent audit.

Which of the following action should you take to meet the requirement?

You want to configure CloudFront to use HTTPS to communicate with your origin Amazon S3 for encrypted connection between CloudFront and Amazon S3.

What action should you take to meet the requirement?

You are working on an app that starts gaining more and more traction. As a result, the user base is increasing day after day at an exponential rate. The more users the app acquired, the more delay the users experience while retrieving data from the database (DynamoDB). Now you are responsible to improve the app’s performance by reducing the database response times down to microseconds.

Which of the following service should you use to meet the requirement?

Your new application is hosted in an Auto Scaling group of EC2 instances. To improve the monitoring process, you have to configure it to keep the average aggregate CPU utilization of your Auto Scaling group at 50 percent. This should be done by specifying the scaling metrics and threshold values for the CloudWatch alarms that trigger the scaling process.

Which of the following scaling policy type you should use?