AWS - SNS and SQS
If an SNS topic has three SQS queues subscribed and a message is published, but one queue's policy denies access, how many queues receive the message?
If an SNS topic has three SQS queues subscribed and a message is published, but one queue's policy denies access, how many queues receive the message?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand access policies impact
If a queue denies access, SNS cannot deliver messages to it.Step 2: Count successful deliveries
Two queues with correct policies receive messages; one denied queue does not.Final Answer:
Only two queues receive the message. -> Option BQuick Check:
Denied policy blocks delivery [OK]
Quick Trick: Queue policy must allow SNS to deliver messages [OK]
Common Mistakes:
- Assuming all queues get messages regardless of policy
- Thinking denied queue still receives messages
- Believing no queues get messages if one denies
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