Evaluate an Application Design Considering Latency and Rate Limiting 350-901 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer is implementing rate limiting for a public API. The requirement is to allow a maximum of 100 requests per hour per user, but also allow a burst of up to 20 requests in a single minute. Which algorithm best satisfies both requirements?

   • AToken bucket with a capacity of 20 tokens and a refill rate of 100 tokens per hour.
   • BLeaky bucket with a capacity of 100 and a leak rate of 100 requests per hour.
   • CSliding window log that tracks all requests in the last hour and rejects any request that would exceed 100.
   • DFixed window counter with a window of 1 hour and a limit of 100 requests.
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2. 2foundation · easy

   Which design pattern is most effective for reducing latency for users geographically distant from the origin server?

   • ALoad balancing
   • BDatabase indexing
   • CAsynchronous processing
   • DContent delivery network (CDN)
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4. 3foundation · easy

   What is the purpose of client-side throttling in an application that consumes a rate-limited API?

   • ATo encrypt requests before sending them to the API
   • BTo reduce the number of requests sent to the API to stay within the allowed rate
   • CTo cache API responses to reduce latency
   • DTo increase the API's rate limit by negotiating with the server
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5. 4application · medium

   A developer is building a client library for a third-party API that has a rate limit of 60 requests per minute. The library must ensure that the client application never exceeds this limit. Which client-side mechanism is most appropriate to enforce this limit?

   • AAdd a delay of 1 second between every request to ensure the rate is never exceeded.
   • BUse a simple counter that increments on each request and resets every 60 seconds, blocking requests after the 60th.
   • CImplement a token bucket in the client library with a capacity of 60 tokens and a refill rate of 1 token per second.
   • DRely on the server to return 429 responses and handle them with retries.
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6. 5foundation · easy

   In which scenario is asynchronous processing most appropriate to meet latency requirements?

   • AWhen a user performs a real-time search that must return results instantly
   • BWhen a user requests a static image that is already cached
   • CWhen a user submits a form that triggers a long-running report generation, and the user does not need the result immediately
   • DWhen a user logs in and needs immediate authentication
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