14. Interpret Sequence Diagram That Includes API Calls 200-901 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   If message B appears below message A on the same lifeline in a sequence diagram, what does that indicate?

   • AMessage B occurs before message A in time
   • BMessage B is more important than message A
   • CMessage B is a response to message A
   • DMessage B occurs after message A in time
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2. 12foundation · easy

   Which sequence diagram element is commonly used to show an exception being thrown during an API call?

   • AA lifeline with a filled circle at its top
   • BA message arrow labeled with the exception name (e.g., 'TimeoutException')
   • CA note attached to the lifeline with the word 'error'
   • DA combined fragment labeled 'break'
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4. 13foundation · easy

   Which combined fragment operator is used in a sequence diagram to show a set of messages that are executed only if a certain condition is true?

   • Apar
   • Bopt
   • Calt
   • Dloop
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5. 14foundation · easy

   In a sequence diagram, how is a synchronous API call typically represented?

   • AA solid arrow from the API back to the caller, with no request arrow
   • BA dashed arrow from the caller to the API, with no return arrow
   • CA loop fragment enclosing the call to indicate repeated attempts
   • DA solid arrowhead pointing from the caller to the API, with a dashed arrow returning the response
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6. 15application · easy

   A sequence diagram includes lifelines for 'Web Portal', 'API Gateway', 'Microservice', and 'Database'. The Web Portal sends a request to the API Gateway, which forwards it to the Microservice, which queries the Database. What is the role of the API Gateway in this architecture?

   • AIt acts as the entry point that routes client requests to the appropriate backend service.
   • BIt performs the business logic for the Microservice.
   • CIt stores the data that the Web Portal requests.
   • DIt generates the user interface for the Web Portal.
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