Services and tasks in AWS - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

Understanding AWS Lambda Execution Model

What happens when an AWS Lambda function is invoked multiple times concurrently?

A AWS Lambda creates multiple instances of the function to handle concurrent invocations.

B AWS Lambda queues the invocations and runs them one by one on a single instance.

C AWS Lambda runs all invocations on the same instance simultaneously using threads.

D AWS Lambda rejects concurrent invocations and returns an error.

💡 Hint

Think about how serverless functions scale with demand.

AWS Lambda automatically scales by creating multiple instances of the function to handle concurrent requests, ensuring fast and isolated execution.

❓ Architecture

intermediate

Choosing the Right AWS Storage Service

You need to store large amounts of unstructured data that must be accessed frequently and support high throughput. Which AWS service is best suited for this?

A Amazon S3

B Amazon EBS

C Amazon RDS

D Amazon DynamoDB

💡 Hint

Think about object storage designed for scalability and throughput.

Amazon S3 is designed for storing large amounts of unstructured data with high durability and throughput, making it ideal for frequent access.

❓ security

advanced

IAM Role Permissions for EC2 Accessing S3

An EC2 instance needs to read objects from a specific S3 bucket. Which IAM policy snippet correctly grants this permission with least privilege?

A {"Effect": "Allow", "Action": "s3:GetObject", "Resource": "arn:aws:s3:::*"}

B {"Effect": "Allow", "Action": "s3:GetObject", "Resource": "arn:aws:s3:::example-bucket/*"}

C {"Effect": "Allow", "Action": "s3:ListBucket", "Resource": "arn:aws:s3:::example-bucket"}

D {"Effect": "Allow", "Action": "s3:*", "Resource": "*"}

💡 Hint

Least privilege means only allow what is necessary.

Option B grants only the permission to get objects from the specific bucket, which is the minimum needed for reading objects.

❓ Configuration

advanced

Configuring Auto Scaling Group with Load Balancer

Which configuration ensures that an Auto Scaling group launches instances that are automatically registered with an Application Load Balancer?

A Use a Network Load Balancer instead of ALB.

B Manually register instances to the ALB after launch.

C Configure the ALB to use static IPs of instances.

D Attach the ALB target group to the Auto Scaling group during creation.

💡 Hint

Think about automation and integration between services.

Attaching the ALB target group to the Auto Scaling group ensures instances are automatically registered and deregistered as they launch or terminate.

✅ Best Practice

expert

Designing Highly Available Multi-Region Architecture

You want to design a web application that remains available even if an entire AWS region goes down. Which architecture approach best achieves this?

A Deploy the application in multiple Availability Zones within a single region.

B Deploy the application in a single region and use CloudFront CDN for caching.

C Deploy the application in multiple regions with active-active traffic routing using Route 53 latency-based routing.

D Deploy the application in multiple regions but route all traffic to a primary region.

💡 Hint

Consider how to handle region-wide failures and traffic distribution.

Deploying in multiple regions with active-active routing ensures the application stays available even if one region fails, by routing users to healthy regions.