Implement Control Flow of Consumer Code for Unrecoverable REST API Errors 350-901 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A script polls the Cisco DNA Center API for a network device's configuration. During a maintenance window, the API returns HTTP 503 Service Unavailable with a Retry-After header of 120 seconds. After the maintenance window ends, the API returns HTTP 400 Bad Request because the device ID in the URL is malformed. How should the script classify these two responses?

   • A503 is recoverable; 400 is unrecoverable
   • BBoth are recoverable with exponential backoff
   • CBoth are unrecoverable and should terminate immediately
   • D503 is unrecoverable; 400 is recoverable
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2. 22application · medium

   A Python script uses the requests library to call the Cisco Intersight API. The script receives an HTTP 400 Bad Request with a JSON error body stating 'Invalid parameter: deviceId'. The script is part of a larger batch job that processes multiple devices. What is the best control flow for this specific request?

   • ARetry the request with the same parameters after a 10-second delay
   • BLog the error, skip this device, and continue with the next device in the batch
   • CTerminate the entire batch job immediately
   • DModify the deviceId parameter to a default value and retry
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4. 23expert · hard

   A Python script processes a list of 100 devices from a CSV file, calling the Cisco DNA Center API to update each device's location. The script uses a single try/except block that catches all HTTPError exceptions and retries each request up to 3 times. During a run, 5 devices return HTTP 404 (device not found) and 3 devices return HTTP 429 (rate limit). The script currently retries both error types, causing the 404s to be retried 3 times each before failing. The team wants to minimize API calls and complete the batch faster. What is the best control flow redesign?

   • ARetry all errors with a longer backoff to reduce the chance of hitting the rate limit
   • BRemove all retry logic and fail the entire batch on the first error
   • CCheck the status code in the except block: retry 429 with backoff, log and skip 404 immediately
   • DRetry 404 errors with a different API endpoint that might find the device
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5. 24application · medium

   A script calls the Cisco DNA Center API to retrieve a list of sites. The API returns HTTP 500 Internal Server Error with a JSON body indicating a database connection failure. The script's current logic retries the request three times. What is the most appropriate classification of this error?

   • AUnrecoverable, because 500 always indicates a permanent server failure
   • BRecoverable, because the client should change the request parameters
   • CUnrecoverable, because the client cannot fix a server-side error
   • DRecoverable, because the server may recover from a transient database failure
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6. 25application · medium

   A Python script uses the requests library to call the Cisco Intersight API. The script receives an HTTP 405 Method Not Allowed when trying to DELETE a resource. The API documentation states that the DELETE method is not supported for this resource type. What is the best control flow?

   • AAutomatically switch to a POST request to perform the deletion
   • BRetry the request with the same DELETE method after a 5-second delay
   • CIgnore the 405 and assume the resource was deleted
   • DLog the error and terminate the script because the operation is not supported
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