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What is the main purpose of a dead letter topic in Google Cloud Pub/Sub?

easy📝 Conceptual Q11 of 15
GCP - Cloud Pub/Sub
What is the main purpose of a dead letter topic in Google Cloud Pub/Sub?
ATo store all successfully delivered messages
BTo speed up message delivery
CTo catch messages that fail delivery multiple times
DTo encrypt messages before sending
Step-by-Step Solution
Solution:
  1. Step 1: Understand message delivery failures

    Messages that cannot be delivered after several attempts need special handling to avoid blocking the main flow.
  2. Step 2: Role of dead letter topics

    Dead letter topics collect these failed messages separately so the main topic stays clean and reliable.
  3. Final Answer:

    To catch messages that fail delivery multiple times -> Option C
  4. Quick Check:

    Dead letter topic = catch failed messages [OK]
Quick Trick: Dead letter topics catch failed messages only [OK]
Common Mistakes:
  • Thinking dead letter topics speed delivery
  • Confusing dead letter topics with encryption
  • Assuming they store successful messages

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