Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 171:

  An application development team decides to use AWS X Ray to monitor application code to analyze performance and perform r cause analysis What does the team need to do to begin using X Ray? (Select TWO )

  A. Log instrumentation output into an Amazon SQS queue

  B. Use a visualization tool to view application traces

  C. Instrument application code using the AWS SDK

  D. Install the X-Ray agent on the application servers

  E. Create an Amazon DynamoDB table to store the trace logs

  Correct Answer: DE

• Question 172:

  A developer is building an application that runs behind an application Load Balancer (ALB). The application is configured as the origin for an Amazon CloudFront distribution. Users will log in to the application using their social media

  accounts.

  How can the developer authenticate and authorize users?

  A. Validate the user by inspecting the tokens using AWS Lambda authorizers on the ALB

  B. Configure the ALB to use Amazon Cognito as one of the authentication providers

  C. Configure Cloudfront to use Amazon Cognito as one of the authentication providers

  D. Authorize the users by calling the Amazon Cognito API in the AWS Lambda authorizer on the ALB

  Correct Answer: C

• Question 173:

  How does Envelope Encryption work in AWS KMS?

  A. The Customer Master Key is used to encrypidecrypt a data key The Plaintext Data Key is used to encrypt customer data.

  B. Two encryption keys are used The Customer Master Key encrypts customer data. The Data Key is used to re-encrypt the encrypted data.

  C. Two encryption keys are used The Data Key encrypts customer data The Customer Master Key is used to re-encrypt the encrypted data

  D. The Customer Master Key is used to encrypt'decrypt a data key. The Encrypted Data Key is used to encrypt customer data.

  Correct Answer: A

• Question 174:

  A developer is leveraging a Border Gateway Protocol (BGP)-based AWS VPN connection to connect from on-premises to Amazon EC2 instances in the developer's account The developer is able to access an EC2 instance in subnet A, but is unable to access an EC2 instance in subnet B in the same VPC Which logs can the developer use to verify whether the traffic is reaching subnet B?

  A. VPN logs

  B. BGP logs

  C. VPC Flow Logs

  D. AWS CloudTrail logs

  Correct Answer: C

• Question 175:

  A developer wants to insert a record into an Amazon DynamoDB table as soon as a new file is added to an Amazon S3 bucket. Which set of steps would be necessary to achieve this?

  A. Create an event with Amazon CloudWatch Events that will monitor the S3 bucket and then insert the records into DynamoDB

  B. Configure an S3 event to invoke a Lambda function that inserts records into DynamoDB

  C. Create a Lambda function that will poll the S3 bucket and then insert the records into DynamoDB.

  D. Create a cron job that will run at a scheduled time and insert the records into DynamoDB

  Correct Answer: A

• Question 176:

  A company has a web application that uses an Amazon Cognito user pool for authentication. The company wants to create a login page with the company logo. What should a developer do to meet these requirements?

  A. Create a hosted user interface in Amazon Cognito and customize it with the company logo

  B. Create a login page with the company logo and upload it to Amazon Cognito

  C. Create a login page in Amazon API Gateway with the logo and save the link in Amazon Cognito.

  D. Upload the logo to the Amazon Cognito app settings and point to the logo on a custom login page

  Correct Answer: A

• Question 177:

  A developer is building an application integrating an Amazon API Gateway with an AWS Lambda function. When calling the API, the developer receives the following error. Wed Nov 03 01:13:00 UTC 2017 : Method completed with status: 502 What should the developer do to resolve the error?

  A. Change the HTTP endpoint of the API to an HTTPS endpoint.

  B. Change the format of the payload sent to the API Gateway.

  C. Change the format of the Lambda function response to the API call

  D. Change the authorization header in the API call to access the Lambda function

  Correct Answer: C

• Question 178:

  An application is processing clickslream data using Amazon Kinesis. The clickstream data feed into Kinesis experiences periodic spikes. The PutRecords API call occasionally fails and the logs show that the failed call returns the response shown below.

  

  Which techniques will help mitigate this exception? (Select TWO.)

  A. Implement retries with exponential backoff

  B. Use a PutRecord API instead of PutRecords

  C. Reduce the frequency and/or size of the requests

  D. Use Amazon SNS instead of Kinesis.

  E. Reduce the number of KCL consumers.

  Correct Answer: AC

  ProvisionedThroughputExceededException: The request rate for the stream is too high, or the requested data is too large for the available throughput. Reduce the frequency or size of your requests.

  Ref https://docs.aws.amazon.com/kinesis/latest/APIReference/API_PutRecords.html

• Question 179:

  An application is using a custom library to make HTTP calls directly to AWS service endpoints. The application is experiencing transient errors that are causing processes to stop when each error is first encountered A request has been made

  to make the application more resilient by adding error retries and exponential backoff.

  How should a developer implement the changes with MINIMAL custom code?

  A. Add a Retry-After HTTP header to API requests.

  B. Use the AWS CLI to configure the retry settings in a named profile

  C. Change the custom library to retry on 5xx errors only

  D. Use an AWS SDK and set retry-specific configurations.

  Correct Answer: B

• Question 180:

  A developer is working on a serverless project based in Java. Initial testing shows a cold start takes about 8 seconds on average for AWS Lambda functions. What should the developer do to reduce the cold start time'?(Select TWO)

  A. Add the Spring Framework to the project and enable dependency injection

  B. Reduce the deployment package by including only the needed modules from the AWS SDK for Java.

  C. Increase the memory allocation setting for the Lambda function.

  D. Increase the timeout setting for the Lambda function.

  E. Change the Lambda invocation mode from synchronous to asynchronous.

  Correct Answer: BC