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An application using AWS SNS fails to notify subscribers. What is a possible misconfiguration?

medium📝 Debug Q7 of 15
AWS - SNS and SQS
An application using AWS SNS fails to notify subscribers. What is a possible misconfiguration?
ASNS topics do not support multiple subscribers
BSubscribers have not confirmed their subscription
CMessages are sent only to SQS queues, not to email
DSNS requires manual message polling by subscribers
Step-by-Step Solution
Solution:

  1. Step 1: Understand SNS subscription confirmation

    Subscribers must confirm their subscription to receive messages.

  2. Step 2: Analyze options

    Subscribers have not confirmed their subscription correctly identifies unconfirmed subscriptions as a cause of failure.

  3. Final Answer:

    Subscribers have not confirmed their subscription -> Option B

  4. Quick Check:

    Unconfirmed subscriptions block notifications [OK]
Quick Trick: Subscribers must confirm SNS subscriptions [OK]
Common Mistakes:
MISTAKES
  • Believing SNS supports only one subscriber
  • Thinking SNS sends only to SQS
  • Assuming SNS requires polling

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