200-901 Question #500: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The sequence diagram shows a RESTful API call. Which step and response will represent the behavior of the REST API call to be synchronous?

Options

• APOST/discovery/ when there is a slot available and get the response from the POST call with the
• BGET/discovery/ when the discovery is finished and get the response from the GET call with the
• CPOST/discovery?discoveryid= when the discovery is created and get the response from the
• DPUT/discovery/ when the discovery is created and get the response of the discovery when it is

Explanation

Synchronous REST API behavior means the client waits and receives the complete result in a single response, not a deferred or polling pattern.

Common mistakes.

• A. A POST that returns immediately when a slot is available provides only a creation acknowledgment, not the finished result - this is the trigger step of an asynchronous flow.
• C. Receiving a response when the discovery is merely created (not finished) means the client must poll later for the result, which is the definition of asynchronous behavior.
• D. PUT is used to update a resource, not to retrieve a completed discovery result; this does not represent a synchronous retrieval of the final outcome.

Concept tested. Synchronous vs asynchronous REST API patterns

Reference. https://developer.cisco.com/docs/dna-center/api/2-3-5/

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