Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 331:

  A Developer has developed a web application and wants to deploy it quickly on a Tomcat server on AWS. The Developer wants to avoid having to manage the underlying infrastructure. What is the easiest way to deploy the application, based on these requirements?

  A. AWS CloudFormation

  B. AWS Elastic Beanstalk

  C. Amazon S3

  D. AWS CodePipeline

  Correct Answer: B

• Question 332:

  A development team consists of 10 team members. Similar to a home directory for each team member the manager wants to grant access to user-specific folders in an Amazon S3 bucket. For the team member with the username "TeamMemberX", the snippet of the IAM policy looks like this:

  

  Instead of creating distinct policies for each team member, what approach can be used to make this policy snippet generic for all team members?

  A. Use IAM policy condition

  B. Use IAM policy principal

  C. Use IAM policy variables

  D. Use IAM policy resource

  Correct Answer: C

  > https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_variables.html > Use AWS Identity and Access Management (IAM) policy variables as placeholders when you don't know the exact value of a resource or condition key when you write the policy.

• Question 333:

  An AWS Lambda function must read data from an Amazon RDS MySQL database in a VPC and also reach a public endpoint over the internet to get additional data. Which steps must be taken to allow the function to access both the RDS resource and the public endpoint? (Select TWO.)

  A. Modify the default configuration for the Lambda function to associate it with an Amazon VPC private subnet.

  B. Modify the default network access control list to allow outbound traffic.

  C. Add a NAT Gateway to the VPC.

  D. Modify the default configuration of the Lambda function to associate it with a VPC public subnet.

  E. Add an environmental variable to the Lambda function to allow outbound internet access.

  Correct Answer: AC

• Question 334:

  After installing the AWS CLI, a Developer tries to run the command aws configure but receives the following error:

  Error: aws: command not found

  What is the most likely cause of this error?

  A. The aws executable is not in the PATH environment variable.

  B. Access to the aws executable has been denied to the installer.

  C. Incorrect AWS credentials were provided.

  D. The aws script does not have an executable file mode.

  Correct Answer: A

  https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-troubleshooting.html

• Question 335:

  A Developer is designing a new application that uses Amazon S3. To satisfy compliance requirements, the Developer must encrypt the data at rest. How can the Developer accomplish this?

  A. Use s3:x-amz-acl as a condition in the S3 bucket policy.

  B. Use Amazon RDS with default encryption.

  C. Use aws:SecureTransport as a condition in the S3 bucket policy.

  D. Turn on S3 default encryption for the S3 bucket.

  Correct Answer: D

• Question 336:

  Which of the following services are included at no additional cost with the use of the AWS platform? Choose 2 answers

  A. Simple Storage Service

  B. Elastic Compute Cloud

  C. Auto Scaling

  D. Elastic Load Balancing

  E. CloudFormation

  F. Simple Workflow Service

  Correct Answer: CE

• Question 337:

  A company is building an application to track athlete performance using an Amazon DynamoDB table. Each item in the table is identified by a partition key (user_id) and a sort key (sport_name). The table design is shown below:

  

  (Note: Not all table attributes are shown)

  A Developer is asked to write a leaderboard application to display the top performers (user_id) based on the score for each sport_name.

  What process will allow the Developer to extract results MOST efficiently from the DynamoDB table?

  A. Use a DynamoDB query operation with the key attributes of user_id and sport_name and order the results based on the score attribute.

  B. Create a global secondary index with a partition key of sport_name and a sort key of score, and get the results

  C. Use a DynamoDB scan operation to retrieve scores and user_id based on sport_name, and order the results based on the score attribute.

  D. Create a local secondary index with a primary key of sport_name and a sort key of score and get the results based on the score attribute.

  Correct Answer: B

  https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/SecondaryIndexes.html https://docs.aws.amazon.com/zh_cn/amazondynamodb/latest/developerguide/GSI.html

• Question 338:

  A Developer is investigating an issue whereby certain requests are passing through an Amazon API Gateway endpoint /MyAPI, but the requests do not reach the AWS Lambda function backing /MyAPI. The Developer found that a second Lambda function sometimes runs at maximum concurrency allowed for the given AWS account.

  How can the Developer address this issue?

  A. Manually reduce the concurrent execution limit at the account level

  B. Add another API Gateway stage for /MyAPI, and shard the requests

  C. Configure the second Lambda function's concurrency execution limit

  D. Reduce the throttling limits in the API Gateway /MyAPI endpoint

  Correct Answer: C

  https://aws.amazon.com/about-aws/whats-new/2017/11/set-concurrency-limits-on-individual-aws- lambda-functions/

  You can now set a concurrency limit on individual AWS Lambda functions. The concurrency limit you set will reserve a portion of your account level concurrency limit for a given function. This feature allows you to throttle a given function if it

  reaches a maximum number of concurrent executions allowed, which you can choose to set.

• Question 339:

  A company is running an application built on AWS Lambda functions. One Lambda function has performance multiple times a second. What solution would give the BEST performance increase?

  A. Cache the file in the /tmp directory

  B. Increase the Lambda maximum execution time

  C. Put an Elastic Load Balancer in front of the Lambda function

  D. Cache the file in Amazon S3

  Correct Answer: A

  https://docs.aws.amazon.com/lambda/latest/dg/runtimes-context.html

• Question 340:

  Company C has recently launched an online commerce site for bicycles on AWS. They have a "Product" DynamoDB table that stores details for each bicycle, such as, manufacturer, color, price, quantity and size to display in the online store. Due to customer demand, they want to include an image for each bicycle along with the existing details.

  Which approach below provides the least impact to provisioned throughput on the "Product" table?

  A. Serialize the image and store it in multiple DynamoDB tables

  B. Create an "Images" DynamoDB table to store the Image with a foreign key constraint to the "Product" table

  C. Add an image data type to the "Product" table to store the images in binary format

  D. Store the images in Amazon S3 and add an S3 URL pointer to the "Product" table item for each image

  Correct Answer: D

  https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-use-s3-too.html#bp-use-s3-too-large-values For example, consider the ProductCatalog table in the Creating Tables and Loading Data for Code Examples in DynamoDB section. Items in this table store information about item price, description, book authors, and dimensions for other products. If you wanted to store an image of each product that was too large to fit in an item, you could store the images in Amazon S3 instead of in DynamoDB.