14. Interpret Sequence Diagram That Includes API Calls 200-901 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   An engineer is reviewing a sequence diagram for a script that backs up device configurations using the Cisco vManage API. The diagram shows a loop fragment labeled 'for each device in list' containing a GET request to retrieve the config, followed by an opt fragment labeled 'if config changed' containing a POST request to save the backup. The engineer needs to determine how many POST requests are sent when there are three devices and only two of them have changed configs. What is the correct interpretation?

   • ANo POST requests are sent because the opt fragment is optional and can be skipped.
   • BThree POST requests are sent, one for each device, because the loop iterates over all devices.
   • COne POST request is sent because the opt fragment is optional and only one backup is needed.
   • DTwo POST requests are sent, one for each device whose config changed.
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2. 2expert · hard

   A sequence diagram for a network automation script shows a synchronous request to the Cisco DNA Center API, followed by an alt fragment with two operands: 'status = 200' and 'status = 500'. The 500 operand contains a self-message labeled 'increment retry counter' and a return message labeled 'error'. The engineer needs to determine whether the script retries the request. What is the correct interpretation?

   • AThe script retries the request exactly once because the self-message increments the counter from 0 to 1.
   • BThe script does not retry the request because there is no loop fragment or second request message in the 500 operand.
   • CThe script retries the request because the self-message indicates a retry loop.
   • DThe script retries the request indefinitely because the alt fragment is inside a loop.
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4. 3application · medium

   A sequence diagram models a Python script calling the Cisco Meraki API to update a network's SSID. The diagram shows a synchronous PUT request, then an alt fragment with two operands: 'status = 200' and 'status = 500'. The 500 operand contains a self-message on the script's lifeline labeled 'log error' and then a return message to the script labeled 'error'. The engineer needs to interpret the error handling flow. What is the correct interpretation?

   • AThe API logs the error and then sends the error response to the script.
   • BThe error response is sent before the script logs the error.
   • CThe script retries the PUT request automatically after logging the error.
   • DThe script logs the error and then receives the error response from the API.
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5. 4foundation · easy

   In a sequence diagram showing an API call, what does each lifeline typically represent?

   • AA network segment between two components
   • BA specific API endpoint within a service
   • CA separate thread of execution within a single component
   • DA distinct component, service, or actor participating in the interaction
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6. 5application · medium

   A sequence diagram shows an automation script sending a POST /jobs request to a job scheduler. The scheduler immediately returns a 202 Accepted response. Later, the scheduler sends a POST /webhook notification to the script. What does this pattern indicate?

   • AThe script polls the scheduler for job status.
   • BThe scheduler rejects the job and sends an error notification.
   • CThe script waits synchronously for the job to complete before continuing.
   • DThe job is processed asynchronously, and the script is notified via a webhook when it completes.
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