Architecting on AWS Certification AWS Certified Solutions Architect - Associate 3

Question 1

A company runs a stateful web application behind an Application Load Balancer. Users are being logged out unexpectedly when requests hit different EC2 instances. What is the simplest fix?

Accepted Answer

Enable sticky sessions on the ALB target group

Answer

Enabling sticky sessions (session affinity) on the ALB target group ensures a user's requests always go to the same instance during their session.

Question 2

Which S3 storage class is most cost-effective for data that is accessed less than once a month and requires rapid retrieval when needed?

Accepted Answer

S3 Glacier Instant Retrieval

Answer

S3 Glacier Instant Retrieval offers the lowest storage cost for rarely accessed data while still providing millisecond retrieval times.

Question 3

A Solutions Architect needs to allow an EC2 instance to call AWS APIs without embedding credentials in the application. What is the best practice?

Accepted Answer

Use an IAM role attached to the EC2 instance

Answer

Attaching an IAM role to an EC2 instance provides temporary credentials automatically via the instance metadata service with no credential management needed.

Question 4

An application needs to send notifications to both an SQS queue and an email subscriber whenever a new order is placed. Which AWS service enables fan-out to multiple endpoints simultaneously?

Accepted Answer

Amazon SNS

Answer

SNS supports a publish/subscribe model that fans out a single message to multiple subscribers including SQS queues and email endpoints.

Question 5

A company's RDS MySQL database is experiencing read bottlenecks. The application performs far more reads than writes. What is the most appropriate solution?

Accepted Answer

Create one or more RDS Read Replicas

Answer

RDS Read Replicas offload read traffic from the primary instance using asynchronous replication, reducing read bottlenecks.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification AWS Certified Solutions Architect - Associate 3