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Given this AWS SNS setup, what happens when a message is published?

medium📝 service behavior Q13 of 15
AWS - SNS and SQS
Given this AWS SNS setup, what happens when a message is published?
Topic: OrderUpdates
Subscribers: Email, SMS
AThe message is stored but not sent to subscribers.
BOnly the email subscriber receives the message.
CNo subscriber receives the message until manually approved.
DBoth email and SMS subscribers receive the message.
Step-by-Step Solution
Solution:

  1. Step 1: Understand SNS topic behavior

    When a message is published to an SNS topic, all subscribers receive the message automatically.

  2. Step 2: Apply to given subscribers

    Since both email and SMS are subscribed, both will get the message.

  3. Final Answer:

    Both email and SMS subscribers receive the message. -> Option D

  4. Quick Check:

    SNS sends to all subscribers = A [OK]
Quick Trick: SNS sends messages to all subscribers automatically [OK]
Common Mistakes:
  • Thinking only one subscriber gets the message
  • Believing manual approval is needed before sending
  • Assuming messages are stored but not delivered

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