Question 49 of 1,389
CCNA AI and Network Operations Practice Question
A network engineer sends an HTTP GET request to a controller API and receives status code 401. What does that response indicate?
⚠ Common exam trap
Be careful not to confuse HTTP 401 with other common status codes like 200, 404, or 500. Each code has a specific meaning and context.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Authentication is required or the token is invalid
HTTP 401 means the request is not authorized because valid authentication credentials were not supplied or were rejected. In practice, this usually means the token is missing, expired, malformed, or otherwise invalid.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The API endpoint does not exist
Why it's wrong here
A nonexistent endpoint would return 404 Not Found, which indicates the resource URL is wrong or not defined in the controller's routing table. This is distinct from an authentication failure, as the server processes the request but cannot match the path, whereas 401 indicates the route may exist but is protected.
When this WOULD be correct
If the exam question stated that a network engineer received a 404 status code when sending a request to a non-existent API endpoint, then option A would be correct. This would clearly indicate that the requested resource could not be found.
- ✗
The request was successful but returned an empty body
Why it's wrong here
A successful request would return a 2xx status such as 200 OK with an empty body if the resource has no data. This contradicts the authentication failure, because a 401 response is not considered successful and would contain error information, not merely an empty body. The presence of a 401 status clearly signals a client authentication problem, not an empty result.
When this WOULD be correct
If the question stated that an API endpoint successfully processed a request but returned no data, a status code of 204 No Content would be appropriate. In that context, option B would correctly describe the situation.
- ✓
Authentication is required or the token is invalid
Why this is correct
This is exactly the meaning of HTTP 401 Unauthorized. When the API controller requires authentication and the request lacks valid credentials or a valid token, it returns 401 with a WWW-Authenticate header prompting the client to provide credentials. The engineer's request failed because the client did not prove identity.
- ✗
The server is overloaded and cannot process the request
Why it's wrong here
This would manifest as a 503 Service Unavailable or 429 Too Many Requests, not a 401 Unauthorized. The controller's inability to handle load is a server-side resource issue, independent of client credentials, and would typically include Retry-After headers or a different error payload.
When this WOULD be correct
If the question asked about a scenario where a server is unable to handle incoming requests due to high traffic, and the response was a 503 status code, then option D would be correct as it directly relates to server capacity issues.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Authentication is required or the token is invalidCorrect answer▾
Why this is correct
This is exactly the meaning of HTTP 401 Unauthorized. When the API controller requires authentication and the request lacks valid credentials or a valid token, it returns 401 with a WWW-Authenticate header prompting the client to provide credentials. The engineer's request failed because the client did not prove identity.
✗The API endpoint does not existWrong answer — click to see why▾
Why this is wrong here
A 401 status code specifically indicates authentication failure, not a missing endpoint. A non-existent endpoint would return a 404 Not Found status code, which is a different HTTP error.
★ When this WOULD be the correct answer
If the exam question stated that a network engineer received a 404 status code when sending a request to a non-existent API endpoint, then option A would be correct. This would clearly indicate that the requested resource could not be found.
Why candidates choose this
Students may confuse 401 (Unauthorized) with 404 (Not Found) because both are client error codes, and they might think an invalid endpoint could trigger an authentication error.
✗The request was successful but returned an empty bodyWrong answer — click to see why▾
Why this is wrong here
A successful request with an empty body would return a 204 No Content status code, not 401. The 401 code explicitly means the request was not processed due to missing or invalid authentication.
★ When this WOULD be the correct answer
If the question stated that an API endpoint successfully processed a request but returned no data, a status code of 204 No Content would be appropriate. In that context, option B would correctly describe the situation.
Why candidates choose this
Students might think that an empty response could be due to authentication failure, but HTTP status codes clearly differentiate between success (2xx) and client errors (4xx).
✗The server is overloaded and cannot process the requestWrong answer — click to see why▾
Why this is wrong here
A server overload is indicated by a 503 Service Unavailable status code, not 401. The 401 code is solely related to authentication issues, not server capacity.
★ When this WOULD be the correct answer
If the question asked about a scenario where a server is unable to handle incoming requests due to high traffic, and the response was a 503 status code, then option D would be correct as it directly relates to server capacity issues.
Why candidates choose this
Test-takers might associate any server-side error with overload, especially if they have seen 500-series codes, but 401 is a client-side authentication error.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Last reviewed: May 17, 2026
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.
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