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AWS Certified Developer Associate Exam (DVA-C02)

Last Update 5 days ago
Total Questions : 368

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Question # 51

You attempt to store an object in the US-STANDARD region in Amazon S3, and receive a confirmation that it has been successfully stored. You then immediately make another API call and attempt to read this object. S3 tells you that the object does not exist

What could explain this behavior?

Options:

A.  

US-STANDARD uses eventual consistency and it can take time for an object to be readable in a bucket

B.  

Objects in Amazon S3 do not become visible until they are replicated to a second region.

C.  

US-STANDARD imposes a 1 second delay before new objects are readable.

D.  

You exceeded the bucket object limit, and once this limit is raised the object will be visible.

Discussion 0
Question # 52

What are the steps to using the AWS CLI to launch a templatized serverless application?

Options:

A.  

Use AWS CloudFormation get-template then CloudFormation execute-change-set.

B.  

Use AWS CloudFormation validate-template then CloudFormation create-change-set.

C.  

Use AWS CloudFormation package then CloudFormation deploy.

D.  

Use AWS CloudFormation create-stack then CloudFormation update-stack.

Discussion 0
Question # 53

In DynamoDB, what type of HTTP response codes indicate that a problem was found with the client request sent to the service?

Options:

A.  

5xx HTTP response code

B.  

200 HTTP response code

C.  

306 HTTP response code

D.  

4xx HTTP response code

Discussion 0
Question # 54

Which statements about DynamoDB are true? Choose 2 answers

Options:

A.  

DynamoDB uses a pessimistic locking model

B.  

DynamoDB uses optimistic concurrency control

C.  

DynamoDB uses conditional writes for consistency

D.  

DynamoDB restricts item access during reads

E.  

DynamoDB restricts item access during writes

Discussion 0
Question # 55

A startup s photo-sharing site is deployed in a VP

C.  

An ELB distributes web traffic across two subnets. ELB session stickiness is configured to use the AWS-generated session cookie, with a session TTL of 5 minutes. The webserver Auto Scaling Group is configured as: min-size=4, max-size=4.

The startups preparing for a public launch, by running load-testing software installed on a single EC2 instance running in us-west-2a. After 60 minutes of load-testing, the webserver logs show:

Which recommendations can help ensure load-testing HTTP requests are evenly distributed across the four webservers? Choose 2 answers

Options:

A.  

Launch and run the load-tester EC2 instance from us-east-1 instead.

B.  

Re-configure the load-testing software to re-resolve DNS for each web request.

C.  

Use a 3rd-party load-testing service which offers globally-distributed test clients.

D.  

Configure ELB and Auto Scaling to distribute across us-west-2a and us-west-2c.

E.  

Configure ELB session stickiness to use the app-specific session cookie.

Discussion 0
Question # 56

You are inserting 1000 new items every second in a DynamoDB table. Once an hour these items are analyzed and then are no longer needed. You need to minimize provisioned throughput, storage, and API calls.

Given these requirements, what is the most efficient way to manage these Items after the analysis?

Options:

A.  

Retain the items in a single table

B.  

Delete items individually over a 24 hour period

C.  

Delete the table and create a new table per hour

D.  

Create a new table per hour

Discussion 0
Question # 57

A Developer has written a serverless application using multiple AWS services. The business logic is written as a Lambda function which has dependencies on third-party libraries. The Lambda function endpoints will be exposed using Amazon API Gateway. The Lambda function will write the information to Amazon DynamoD

B.  

The Developer is ready to deploy the application but must have the ability to rollback. How can this deployment be automated, based on these requirements?

Options:

A.  

Deploy using Amazon Lambda API operations to create the Lambda function by providing a deployment package.

B.  

Use an AWS CloudFormation template and use CloudFormation syntax to define the Lambda function resource in the template.

C.  

Use syntax conforming to the Serverless Application Model in the AWS CloudFormation template to define the Lambda function resource.

D.  

Create a bash script which uses AWS CLI to package and deploy the application.

Discussion 0
Question # 58

An ecommerce application is using Amazon Simple Notification Service (Amazon SNS) with an AWS Lambda subscription to save all new orders into an Amazon DynamoDB table The company wants to record all the orders that are more than a certain amount of money in a separate table The company wants to avoid changes to the processes that post orders to Amazon SNS or the current Lambda function that saves the orders to the DynamoDB table

How can a developer implement this feature with the LEAST change to the existing application?

Options:

A.  

Create another Lambda subscription with the SNS message attribute value matching a filter option to save the appropriate orders to a separate table.

B.  

Create another SNS topic, and also send orders in that topic Create a Lambda subscription with a numeric value filter option to save the appropriate orders to a separate table.

C.  

Create another Lambda subscription with the SNS message numeric value matching a filter option to save the appropriate orders to a separate table.

D.  

Modify the Lambda code to filter the orders and save the appropriate orders to a separate table

Discussion 0
Question # 59

A developer is working on an ecommerce website. The developer wants to review server logs without logging in to each of the application servers individually. The website runs on multiple Amazon EC2 instances, is written in Python, and needs to be highly available.

How can the developer update the application to meet these requirements with MINIMUM changes?

Options:

A.  

Rewrite the application to be cloud native and to run on AWS Lambda where the logs can be reviewed in Amazon CloudWatch.

B.  

Set up centralized logging by using Amazon Elasticsearch Service (Amazon ES), Logstash, and Kibana

C.  

Scale down the application to one larger EC2 instance where only one instance is recording logs.

D.  

Install the unified Amazon CloudWatch agent on the EC2 instances. Configure the agent to push the application logs to CloudWatch.

Discussion 0
Question # 60

A developer is creating an application that is based on an AWS Lambda function The function uses the AWS SDK to read product price data from an Amazon S3 bucket and to write user information to an Amazon Aurora DB instance The Lambda function runs often, up to a few times each minute To meet performance requirements, the developer must minimize the run duration of the Lambda function

Which actions can help the developer increase the performance? (Select TWO )

Options:

A.  

Initialize SDK clients and database connections outside of the function handler

B.  

Read the S3 product price data initially, and cache it locally in the /tmp directory.

C.  

Use environment variables to pass operational parameters to the function.

D.  

Use most-restrictive permissions when setting the 1AM policies for the Lambda 1AM role.

E.  

Split the code into different Lambda functions to keep the functions smaller.

Discussion 0
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