Implement Robust REST API Error Handling for Time Outs and Rate Limits 350-901 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   An API returns HTTP 429 with a JSON body containing `{"error": "rate_limit_exceeded", "retry_after": 30}` but no `Retry-After` header. What is the most appropriate way for the client to determine when to retry?

   • AUse the `retry_after` value from the response body
   • BRetry immediately
   • CAbandon the request
   • DUse a fixed 5-second delay
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2. 17application · medium

   A developer is building a client for a Cisco Umbrella API. The API documentation states that rate limits are enforced per minute and the response headers include X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset. The developer wants to ensure the client never exceeds the rate limit. What should the client do before each request?

   • ACalculate the request rate based on X-RateLimit-Limit and sleep between requests to stay under the limit.
   • BIgnore the rate limit headers and implement a fixed delay of 1 second between requests.
   • CSend the request and rely on the 429 response to know when to slow down.
   • DCheck X-RateLimit-Remaining from the last response; if it is 0, wait until X-RateLimit-Reset before sending the next request.
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4. 18expert · hard

   An engineer is designing a retry strategy for a Cisco FMC API client. The client sends a POST request to create an access policy. The request times out after 30 seconds. The engineer is unsure if the server processed the request. What should the engineer do?

   • ATreat the timeout as a permanent error and log the failure without any further action.
   • BRetry the POST immediately with the same payload, since the timeout likely means the request never reached the server.
   • CDo not retry the POST automatically; instead, query the server to check if the access policy was created, and only retry if it was not.
   • DRetry the POST with a different payload to avoid duplicate creation.
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5. 19application · medium

   A Python script using the requests library calls a Cisco DNA Center API. The script sets timeout=(3.05, 27) and receives a 'Connection timed out' exception. What does this exception indicate?

   • AThe server did not send a response within 27 seconds of the request being sent.
   • BThe client could not establish a TCP connection to the server within 3.05 seconds.
   • CThe total request time exceeded 30.05 seconds.
   • DThe server responded with an HTTP 408 status code.
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6. 20application · medium

   A network automation engineer is writing a Python script that calls a Cisco DNA Center API to retrieve site inventory. The script occasionally fails with a 'Read timed out' exception after 30 seconds, even though the API eventually completes the request. The engineer wants to allow the API more time to respond without making the script hang indefinitely. Which approach should the engineer take?

   • ASet a single total timeout of 60 seconds for the entire request and disable retries to avoid duplicate requests.
   • BIncrease the read timeout to 60 seconds while keeping the connection timeout at 5 seconds, and add a retry with exponential backoff for the timeout exception.
   • CIncrease the connection timeout to 60 seconds and keep the read timeout at 30 seconds, with no retry logic.
   • DKeep the current timeouts and add a retry that waits exactly 30 seconds before each attempt, up to three times.
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