DJames617 Service Comparison
SQS vs SNS vs EventBridge
All decouple systems, but queueing, fanout, and event routing are not the same.
What They Have in Common
Each option can solve part of the scenario. The exam expects you to choose the one that satisfies the stated constraints with the right operational burden, security boundary, availability model, and cost behavior.
Key Differences
| Option | Primary model | Best use | Security | Availability | Operations and cost |
|---|---|---|---|---|---|
| SQS | Queue | Buffer work, retry, DLQ, consumer polling | Queue policy, SSE, IAM | Durable backlog, at-least-once | Requests and retries |
| SNS | Pub/sub topic | Fanout notifications to multiple subscribers | Topic policy, SSE, subscription confirmation | Subscriber durability varies | Publishes and deliveries |
| EventBridge | Event bus/rules | Route events by pattern, SaaS/AWS integration, scheduler | Bus policy, target role | Retries, DLQ, archive/replay options | Published events, archive, replay |
Typical Exam Clues
Practice After Studying
Return to the certification guide that includes this comparison and launch domain training from there.