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What is the main idea behind the Fixed window algorithm in rate limiting?

easy🧠 Conceptual Q11 of Q15
Rest API - Rate Limiting and Throttling

What is the main idea behind the Fixed window algorithm in rate limiting?

ACount requests in fixed time intervals and block if limit exceeded
BAllow unlimited requests without any restrictions
CCount requests over a sliding time window for smooth limiting
DBlock all requests after the first one
Step-by-Step Solution
Solution:

  1. Step 1: Understand fixed window concept

    The fixed window algorithm divides time into fixed intervals (windows) and counts requests in each interval.

  2. Step 2: Identify how blocking works

    If the number of requests in the current window exceeds the limit, further requests are blocked until the next window.

  3. Final Answer:

    Count requests in fixed time intervals and block if limit exceeded -> Option A

  4. Quick Check:

    Fixed window = count + block in fixed intervals [OK]
Quick Trick: Fixed window counts requests per fixed time block [OK]
Common Mistakes:
MISTAKES
  • Confusing fixed window with sliding window algorithm
  • Thinking it allows unlimited requests
  • Assuming it blocks all requests immediately

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