Architecting on AWS Certification Welding Procedures & Techniques 5

Question 1

An application experiences database bottlenecks due to read-heavy traffic. Which approach offloads reads from the primary RDS instance?

Accepted Answer

Add RDS Read Replicas and direct read traffic to them

Answer

Read Replicas serve read queries from a copy of the database, reducing load on the primary writer instance.

Question 2

A web application needs to serve static assets globally with the lowest possible latency. Which combination is optimal?

Accepted Answer

S3 as origin with Amazon CloudFront distribution

Answer

CloudFront caches S3 objects at 400+ edge locations worldwide, delivering assets to users from the nearest point of presence.

Question 3

An application requires session state to be shared across multiple EC2 instances behind a load balancer without sticky sessions. What is the recommended approach?

Accepted Answer

Use Amazon ElastiCache (Redis) to store session state centrally

Answer

ElastiCache Redis provides a fast, centralized session store accessible by all instances, enabling stateless scaling.

Question 4

Which AWS Auto Scaling policy type scales based on a predictable, time-based traffic pattern such as business hours?

Accepted Answer

Scheduled Scaling

Answer

Scheduled Scaling lets you pre-define scale-out and scale-in actions at specific times to match known traffic patterns.

Question 5

A microservices application has one slow service that causes cascading failures across other services. Which pattern prevents this?

Accepted Answer

Circuit Breaker pattern implemented in each service client

Answer

A circuit breaker stops sending requests to a failing service, giving it time to recover and preventing cascading failures.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Welding Procedures & Techniques 5