Evaluate an Application Design Considering Latency and Rate Limiting 350-901 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which HTTP status code is typically returned by a server when a client exceeds the rate limit?

   • A403 Forbidden
   • B302 Found
   • C500 Internal Server Error
   • D429 Too Many Requests
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2. 17application · medium

   A company's web application has a feature that generates a PDF report from a large dataset. The report generation takes 30 seconds. The user clicks a button and currently waits 30 seconds for the PDF to download. The product owner wants the user to be able to continue using the application while the report is generated. Which design change best achieves this?

   • ASubmit the report generation as a background job and provide a link to download the PDF when it is ready.
   • BOptimize the database query to reduce the report generation time to 5 seconds.
   • CIncrease the web server's request timeout to 60 seconds to allow the synchronous request to complete.
   • DUse a WebSocket to stream the PDF data to the client as it is generated.
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4. 18application · medium

   An API gateway is configured with a rate limit of 10 requests per second per client. A developer notices that a client can send 20 requests in the first half of a second and then 0 requests for the rest of the second, and all 20 are accepted. Which rate limiting algorithm is most likely being used, and what is the flaw?

   • AToken bucket; it allows bursts up to the bucket capacity, which is set to 20.
   • BLeaky bucket; it processes requests at a constant rate, so 20 requests in half a second would be queued and processed over 2 seconds.
   • CFixed window counter; it allows a burst at the boundary between two windows, effectively doubling the limit.
   • DSliding window log; it tracks each request's timestamp and rejects requests that exceed the limit within the last second.
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5. 19application · medium

   A company's API is deployed in a single region, and users in another continent report high latency. The API performs a database lookup that takes 50 ms, and the network round-trip time for remote users is 300 ms. Which change would most effectively reduce the total latency for these remote users?

   • AIncrease the bandwidth of the network connection to the remote users.
   • BAdd a CDN in front of the API to cache the API responses.
   • CDeploy the API and database to a region closer to the remote users.
   • DOptimize the database query to reduce the lookup time to 10 ms.
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6. 20application · medium

   A web application performs a complex image-processing operation that takes 2 seconds to complete. The user interface must remain responsive and show a confirmation immediately. Which design pattern best meets the user experience requirement?

   • AMove the image-processing code to the client-side to run in the browser's JavaScript engine.
   • BCache the result of the image-processing operation in memory to avoid re-processing the same image.
   • CIncrease the HTTP server's timeout to 10 seconds so the synchronous request can complete without timing out.
   • DProcess the image asynchronously in a background job and have the frontend poll for the result or use a WebSocket to receive a completion notification.
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