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System Design Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
hard
System Design
Why is exactly-once delivery described as genuinely hard to guarantee end-to-end in a distributed system?
A
It's actually trivial and this is a common misconception
B
Because coordinating 'delivered and processed exactly once' across independent, potentially-failing components (network, consumer, external side effects) has no free universal solution — real guarantees are often narrower than they sound
C
Because it requires a faster network
D
Because it only applies to pub/sub, never to queues
Check Answer