Construct a Sequence Diagram That Includes API Calls 350-901 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   An engineer is constructing a sequence diagram for an order processing system. The client calls the order service, which then calls the inventory service to check stock. If stock is available, the order service calls the payment service. If not, it returns an error to the client. Which UML combined fragment should be used to represent the conditional logic for checking stock?

   • AA 'opt' fragment for the error path only
   • BA 'par' fragment containing both the payment and error paths
   • CAn 'alt' fragment with two operands: one for 'stock available' and one for 'stock not available'
   • DA 'loop' fragment around the inventory check
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2. 7expert · hard · select all that apply

   A developer is constructing a sequence diagram for a microservices workflow. The client calls the order service. The order service calls the inventory service and the payment service in parallel. After both responses are received, the order service returns a confirmation to the client. Which elements are required to accurately represent this workflow? (Select all that apply.)

   • AActivation bars on the order service lifeline for the duration of the parallel calls
   • BA single lifeline for the inventory and payment services
   • CA 'par' combined fragment around the calls to the inventory and payment services
   • DSeparate lifelines for the order service, inventory service, and payment service
   • EA 'loop' fragment around the entire workflow
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4. 8foundation · easy

   When modeling an API call in a sequence diagram, which two elements are typically shown as messages between lifelines?

   • AThe authentication token and the status code
   • BThe header and the body
   • CThe request and the response
   • DThe endpoint and the payload
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5. 9foundation · easy

   In a sequence diagram that models an API call, what does a message arrow labeled `GET /users` from the 'Client' lifeline to the 'API Server' lifeline represent?

   • AThe activation of the client's lifeline
   • BThe destruction of the API server's lifeline
   • CThe HTTP response returned by the API server
   • DThe API request being sent from the client to the server
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6. 10foundation · easy

   In a sequence diagram, what does a thin vertical rectangle placed on a lifeline represent?

   • AThe period during which the participant is actively processing a message
   • BThe destruction of the participant's lifeline
   • CThe creation of a new participant
   • DThe time when the participant is idle and waiting for input
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