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In the fixed window algorithm, what happens when the request count exceeds the limit within the current window?

easy🧠 Conceptual Q2 of Q15
Rest API - Rate Limiting and Throttling

In the fixed window algorithm, what happens when the request count exceeds the limit within the current window?

ARequests are blocked until the next window starts
BRequests are queued indefinitely
CRequests are processed normally
DThe window size increases automatically
Step-by-Step Solution
Solution:
  1. Step 1: Recall fixed window behavior on limit exceed

    When requests exceed the limit, the algorithm blocks further requests in that window.
  2. Step 2: Understand what happens next

    Requests are blocked until the next time window starts, then counting resets.
  3. Final Answer:

    Requests are blocked until the next window starts -> Option A
  4. Quick Check:

    Exceed limit = Block requests until reset [OK]
Quick Trick: Exceeding limit blocks requests until window resets [OK]
Common Mistakes:
MISTAKES
  • Assuming requests queue indefinitely
  • Thinking requests still go through
  • Believing window size changes automatically

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