14. Interpret Sequence Diagram That Includes API Calls 200-901 Practice Questions (Page 4)

Questions 16–20

1. 16application · easy

   A sequence diagram shows an alt fragment with two operands. The first operand is guarded by 'if device is reachable' and contains a GET /config message. The second operand is guarded by 'else' and contains a POST /alerts message. What does this diagram indicate?

   • AThe configuration is retrieved only if an alert is sent first.
   • BThe configuration is retrieved and an alert is sent in all cases.
   • CIf the device is reachable, the configuration is retrieved; otherwise, an alert is sent.
   • DThe alert is sent only if the device is reachable.
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2. 17expert · medium

   A sequence diagram shows an API client sending a GET /config request. The server responds with a 404 Not Found. The client then enters an opt fragment labeled 'if backup exists' and sends a GET /backup/config request. The server responds with 200 OK. What does this sequence indicate?

   • AThe client ignores the 404 and proceeds with the next step.
   • BThe client retries the primary configuration request after receiving a 404.
   • CThe client falls back to a backup configuration when the primary configuration is not found.
   • DThe client sends both requests simultaneously to ensure it gets a configuration.
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4. 18application · medium

   A sequence diagram includes lifelines for 'Automation Controller', 'REST API', and 'Network Device'. The Automation Controller sends a request to the REST API, which then sends a CLI command to the Network Device. The Network Device returns output to the REST API, which returns it to the Controller. What is the role of the REST API in this system?

   • AIt directly manages the network device without any translation.
   • BIt provides a user interface for the automation controller.
   • CIt translates RESTful requests into CLI commands for the network device.
   • DIt stores the configuration of the network device.
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5. 19foundation · easy

   In a UML sequence diagram, which element is represented by a vertical dashed line descending from an object or actor?

   • ALifeline
   • BActivation bar
   • CMessage arrow
   • DCombined fragment
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6. 20expert · hard

   A sequence diagram shows two lifelines: 'Script A' and 'Script B', both interacting with the same 'Cisco Meraki API' lifeline. The diagram shows Script A sending a GET request, then Script B sending a GET request, then the API responding to Script A, and finally the API responding to Script B. The engineer needs to determine whether the API processes the requests concurrently or sequentially. Which observation is most relevant?

   • AThe API's activation bar for Script A's request ends before the activation bar for Script B's request begins.
   • BThe two GET requests are sent at different vertical positions on the diagram.
   • CThe responses to Script A and Script B are both dashed arrows.
   • DThe two scripts are on separate lifelines.
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