350-901 Rest Practice Questions
The free 350-901: Developing Applications using Cisco Core Platforms and APIs (DEVCOR) questions that deal with rest, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #6
A developer has completed the implementation of a REST API, but when it is executed, it returns a 401 error message. What must be done on the API to resolve the issue?
Correct answer: B
Explanation
401 Unauthorized signals missing or invalid authentication, so new valid credentials must be configured; an authenticated caller lacking permission would receive 403 instead.
Question #9
Refer to the exhibit. Two editors are concurrently updating an article’s headline from their mobile devices. What results from this scenario based on this REST API sequence?

Correct answer: D
Explanation
Client1's conditional PUT with the matching ETag succeeds (200, new ETag) and sets the headline to Top Headlines; Client2's PUT with the stale ETag fails with 412 Precondition Failed, so nothing else changes.
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