Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 601:

  Company B provides an online image recognition service and utilizes SQS to decouple system components for scalability The SQS consumers poll the imaging queue as often as possible to keep end-to-end throughput as high as possible. However, Company B is realizing that polling in tight loops is burning CPU cycles and increasing costs with empty responses.

  How can Company B reduce the number of empty responses?

  A. Set the imaging queue visibility Timeout attribute to 20 seconds

  B. Set the Imaging queue ReceiveMessageWaitTimeSeconds attribute to 20 seconds

  C. Set the imaging queue MessageRetentionPeriod attribute to 20 seconds

  D. Set the DelaySeconds parameter of a message to 20 seconds

  Correct Answer: B

  https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-short-and- long-polling.html

• Question 602:

  A Developer is working on an application that tracks hundreds of millions of product reviews in an Amazon DynamoDB table. The records include the data elements shown in the table:

  

  Which field, when used as the partition key, would result in the MOST consistent performance using DynamoDB?

  A. starRating

  B. reviewID

  C. comment

  D. productID

  Correct Answer: D

  Refer AWS documentation - DynamoDB Design partition key

  The partition key portion of a table's primary key determines the logical partitions in which a table's data is stored. This in turn affects the underlying physical partitions. Provisioned I/O capacity for the table is divided evenly among these physical partitions. Therefore a partition key design that doesn't distribute I/O requests evenly can create "hot" partitions that result in throttling and use your provisioned I/O capacity inefficiently.

  The optimal usage of a table's provisioned throughput depends not only on the workload patterns of individual items, but also on the partition-key design. This doesn't mean that you must access all partition key values to achieve an efficient throughput level, or even that the percentage of accessed partition key values must be high. It does mean that the more distinct partition key values that your workload accesses, the more those requests will be spread across the partitioned space. In general, you will use your provisioned throughput more efficiently as the ratio of partition key values accessed to the total number of partition key values increases.

• Question 603:

  The development team is working on an API that will be served from Amazon API gateway. The API will be served from three environments: development, test, and production. The API Gateway is configured to use 237 GB of cache in all three stages.

  Which is the MOST cost-efficient deployment strategy?

  A. Create a single API Gateway with all three stages.

  B. Create three API Gateways, one for each stage in a single AWS account.

  C. Create an API Gateway in three separate AWS accounts.

  D. Enable the cache for development and test environments only when needed.

  Correct Answer: D

• Question 604:

  Your application is trying to upload a 6 GB file to Simple Storage Service and receive a "Your proposed upload exceeds the maximum allowed object size." error message. What is a possible solution for this?

  A. None, Simple Storage Service objects are limited to 5 GB

  B. Use the multi-part upload API for this object

  C. Use the large object upload API for this object

  D. Contact support to increase your object size limit

  E. Upload to a different region

  Correct Answer: B

  https://docs.aws.amazon.com/AmazonS3/latest/dev/mpuoverview.html

• Question 605:

  An e-commerce web application that shares session state on-premises is being migrated to AWS. The application must be fault tolerant, natively highly scalable, and any service interruption should not affect the user experience. What is the best option to store the session state?

  A. Store the session state in Amazon ElastiCache

  B. Store the session state in Amazon CloudFront

  C. Store the session state in Amazon S3

  D. Enable session stickiness using elastic load balancers

  Correct Answer: A

  https://aws.amazon.com/caching/session-management/

• Question 606:

  A company is using Amazon RDS MySQL instances for its application database tier and Apache Tomcat servers for its web tier. Most of the database queries from web applications are repeated read requests. Use of which AWS service would increase in performance by adding in-memory store for repeated read queries?

  A. Amazon RDS Multi-AZ

  B. Amazon SQS

  C. Amazon ElastiCache

  D. Amazon RDS read replica

  Correct Answer: C

• Question 607:

  If a message is retrieved from a queue in Amazon SQS, how long is the message inaccessible to other users by default?

  A. 0 seconds

  B. 1 hour

  C. 1 day

  D. forever

  E. 30 seconds

  Correct Answer: E

  https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility- timeout.html

  Visibility timeout:

  default value = 30 seconds,

  minimum = 0 seconds,

  maximum = 12 hours

• Question 608:

  Given the source code for an AWS Lambda function in the local store.py containing a handler function called get_store and the following AWS CloudFormation template:

  

  What should be done to prepare the template so that it can be deployed using the AWS CLI command aws cloudformation deploy?

  A. Use aws cloudformation compile to base64 encode and embed the source file into a modified CloudFormation template.

  B. Use aws cloudformation package to upload the source code to an Amazon S3 bucket and produce a modified CloudFormation template.

  C. Use aws lambda zip to package the source file together with the CloudFormation template and deploy the resulting zip archive.

  D. Use aws serverless create-package to embed the source file directly into the existing CloudFormation template.

  Correct Answer: B

  https://docs.aws.amazon.com/cli/latest/reference/cloudformation/package.html

• Question 609:

  A Developer wants to encrypt new objects that are being uploaded to an Amazon S3 bucket by an application. There must be an audit trail of who has used the key during this process. There should be no change to the performance of the application.

  Which type of encryption meets these requirements?

  A. Server-side encryption using S3-managed keys

  B. Server-side encryption with AWS KMS-managed keys

  C. Client-side encryption with a client-side symmetric master key

  D. Client-side encryption with AWS KMS-managed keys

  Correct Answer: A

• Question 610:

  A stock market monitoring application uses Amazon Kinesis for data ingestion. During simulated tests of peak data rates, the Kinesis stream cannot keep up with the incoming data. What step will allow Kinesis to accommodate the traffic during peak hours?

  A. Install the Kinesis Producer Library (KPL) for ingesting data into the stream.

  B. Reduce the data retention period to allow for more data ingestion using DecreaseStreamRetentionPeriod.

  C. Increase the shard count of the stream using UpdateShardCount.

  D. Ingest multiple records into the stream in a single call using PutRecords.

  Correct Answer: C

  https://docs.aws.amazon.com/streams/latest/dev/developing-producers-with-kpl.html