Question 1

A Developer manages a monitoring service for a fleet of IoT sensors in a major city. The monitoring application uses an Amazon Kinesis Data Stream with a group of EC2 instances processing the data. Amazon CloudWatch custom metrics show that the instances a reaching maximum processing capacity and there are insufficient shards in the Data Stream to handle the rate of data flow.

What course of action should the Developer take to resolve the performance issues?

Options :

A : Increase the EC2 instance size and add shards to the stream

B : Increase the number of open shards

C : Increase the number of EC2 instances to match the number of shards

D : Increase the EC2 instance size

Answer: A

Question 2

A company has deployed a REST API using Amazon API Gateway with a Lambda authorizer. The company needs to log who has accessed the API and how the caller accessed the API. They also require logs that include errors and execution traces for the Lambda authorizer.

Which combination of actions should the Developer take to meet these requirements? (Select TWO.)

Options :

A : Enable API Gateway execution logging

B : Enable detailed logging in Amazon CloudWatch.

C : Create an API Gateway usage plan.

D : Enable API Gateway access logs.

E : Enable server access logging.

Answer: A,D

Question 3

A developer is building a serverless application on AWS for a workflow that processes high volumes of data. In the workflow, an AWS Step Functions state machine invokes several AWS Lambda functions.

One of the Lambda functions occasionally fails because of timeout errors during periods of high demand. The developer must ensure that the workflow automatically retries the failed function invocation if a timeout error occurs.

Which solution will meet this requirement?

Options :

A : Add a Retry field in the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts and the timeout error type to retry on.

B : Add a Timeout field in the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts.

C : Add a Fail state to the Step Functions state machine definition. Configure the state machine with the maximum number of retry attempts.

D : Update the Step Functions state machine to pass the invocation request to an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe a Lambda function to the SNS topic. Configure the Lambda function with the maximum number of retry attempts for a timeout error type.

Answer: A

Question 4

A mobile application has thousands of users. Each user may use multiple devices to access the application. The Developer wants to assign unique identifiers to these users regardless of the device they use.

Which of the below is the BEST method to obtain unique identifiers?

Options :

A : Implement developer-authenticated identities by using Amazon Cognito and get credentials for these identities

B : Create a user table in Amazon DynamoDB with key-value pairs of users and their devices. Use these keys as unique identifiers

C : Use IAM-generated access key IDs for the users as the unique identifier, but do not store secret keys

D : Assign IAM users and roles to the users. Use the unique IAM resource ID as the unique identifier

Answer: A

Question 5

An organization has an Amazon S3 bucket containing premier content that they intend to make available to only paid subscribers of their website. The objects in the S3 bucket are private to prevent inadvertent exposure of the premier content to non-paying website visitors.

How can the organization provide only paid subscribers the ability to download the premier content in the S3 bucket?

Options :

A : Enable server-side encryption on the S3 bucket for data protection against the non-paying website visitors

B : Apply a bucket policy that grants anonymous users to download the content from the S3 bucket

C : Generate a pre-signed object URL for the premier content file when a paid subscriber requests a download

D : Add a bucket policy that requires Multi-Factor Authentication for requests to access the S3 bucket objects

Answer: C