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QUESTION 724
A company is building a new furniture inventory application. The company has deployed the application on a fleet of Amazon EC2 instances across multiple Availability Zones. The EC2 instances run behind an Application Load Balancer (ALB) in their VPC.
A solutions architect has observed that incoming traffic seems to favor one EC2 instance resulting in latency for some requests.
What should the solutions architect do to resolve this issue?

A. Disable session affinity (sticky sessions) on the ALB
B. Replace the ALB with a Network Load Balancer
C. increase the number of EC2 instances in each Availability Zone
D. Adjust the frequency of the health checks on the ALB’s target group

Answer: B

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QUESTION 158
A company needs to quickly make sense of a large amount of data and gain insight from it. The data is in different formats, the schemas change frequently, and new data sources are added regularly. The company wants to use AWS services to explore multiple data sources, suggest schemas, and enrich and transform the data. The solution should require the least possible coding effort for the data flows and the least possible infrastructure management.
Which combination of AWS services will meet these requirements?

A. Amazon EMR for data discovery, enrichment, and transformation
Amazon Athena for querying and analyzing the results in Amazon S3 using standard SQL
Amazon QuickSight for reporting and getting insights
B. Amazon Kinesis Data Analytics for data ingestion
Amazon EMR for data discovery, enrichment, and transformation
Amazon Redshift for querying and analyzing the results in Amazon S3
C. AWS Glue for data discovery, enrichment, and transformation
Amazon Athena for querying and analyzing the results in Amazon S3 using standard SQL
Amazon QuickSight for reporting and getting insights
D. AWS Data Pipeline for data transfer
AWS Step Functions for orchestrating AWS Lambda jobs for data discovery, enrichment, and transformation
Amazon Athena for querying and analyzing the results in Amazon S3 using standard SQL
Amazon QuickSight for reporting and getting insights

Answer: A

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QUESTION 120
A SysOps administrator is troubleshooting connection timeouts to an Amazon EC2 instance that has a public IP address. The instance has a private IP address of 172.31.16.139. When the SysOps administrator tries to ping the instance’s public IP address from the remote IP address 203.0.113.12, the response is “request timed out.” The flow logs contain the following information:

What is one cause of the problem?

A. Inbound security group deny rule
B. Outbound security group deny rule
C. Network ACL inbound rules
D. Network ACL outbound rules

Answer: D

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QUESTION 967
A company runs a multi-tier web application with two Amazon EC2 instances in one Availability Zone in the us-east-1 Region. A SysOps administrator must migrate one of the EC2 instances to a new Availability Zone.
Which solution will accomplish this?

A. Copy the EC2 instance to a different Availability Zone.
Terminate the original instance.
B. Create an Amazon Machine Image (AMI) from the EC2 instance and launch it in a different Availability Zone.
Terminate the original instance.
C. Move the EC2 instance to a different Availability Zone using the AWS CLI.
D. Stop the EC2 instance, modify the Availability Zone, and start the instance.

Answer: B

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QUESTION 654
A company is building a web-based application running on Amazon EC2 instances in multiple Availability Zones. The web application will provide access to a repository of text documents totaling about 900 TB in size. The company anticipates that the web application will experience periods of high demand. A solutions architect must ensure that the storage component for the text documents can scale to meet the demand of the application at all times. The company is concerned about the overall cost of the solution.
Which storage solution meets these requirements MOST cost-effectively?

A. Amazon Elastic Block Store (Amazon EBS)
B. Amazon Elastic File System (Amazon EFS)
C. Amazon Elasticsearch Service (Amazon ES)
D. Amazon S3

Answer: C

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QUESTION 658
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 Cloudfron 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

Answer: C

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QUESTION 82
A Data Scientist is building a model to predict customer churn using a dataset of 100 continuous numerical features. The Marketing team has not provided any insight about which features are relevant for churn prediction. The Marketing team wants to interpret the model and see the direct impact of relevant features on the model outcome. While training a logistic regression model, the Data Scientist observes that there is a wide gap between the training and validation set accuracy.
Which methods can the Data Scientist use to improve the model performance and satisfy the Marketing team’s needs? (Choose two.)

A. Add L1 regularization to the classifier
B. Add features to the dataset
C. Perform recursive feature elimination
D. Perform t-distributed stochastic neighbor embedding (t-SNE)
E. Perform linear discriminant analysis

Answer: BE

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QUESTION 632
A company is developing a new service that will be accessed using TCP on a static port. A solutions architect must ensure that the service is highly available, has redundancy across Availability Zones, and is accessible using the DNS name my.service.com, which is publicly accessible. The service must use fixed address assignments so other companies can add the addresses to their allow lists.
Assuming that resources are deployed in multiple Availability Zones in a single Region, which solution will meet these requirements?

A. Create Amazon EC2 instances with an Elastic IP address for each instance.
Create a Network Load Balancer (NLB) and expose the static TCP port.
Register EC2 instances with the NLB.
Create a new name server record set named my.service.com, and assign the Elastic IP addresses of the EC2 instances to the record set.
Provide the Elastic IP addresses of the EC2 instances to the other companies to add to their allow lists.
B. Create an Amazon ECS cluster and a service definition for the application.
Create and assign public IP addresses for the ECS cluster.
Create a Network Load Balancer (NLB) and expose the TCP port.
Create a target group and assign the ECS cluster name to the NLB.
Create a new A record set named my.service.com, and assign the public IP addresses of the ECS cluster to the record set.
Provide the Public IP addresses of the ECS cluster to the other companies to add to their allow lists.
C. Create Amazon EC2 instances for the service.
Create one Elastic IP address for each Availability Zone.
Create a Network Load Balancer (NLB) and expose the assigned TCP port.
Assign the Elastic IP addresses to the NLB for each Availability Zone.
Create a target group and register the EC2 instances with the NLB.
Create a new A (alias) record set named my.service.com, and assign the NLB DNS name to the record set.
D. Create an Amazon ECS cluster and a service definition for the application.
Create and assign public IP address for each host in the cluster.
Create an Application Load Balancer (ALB) and expose the static TCP port.
Create a target group and assign the ECS service definition name to the ALB.
Create a new CNAME record set and associate the public IP addresses to the record set.
Provide the Elastic IP addresses of the Amazon EC2 instances to the other companies to add to their allow lists.

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