This 200-901 practice question tests your understanding of understanding and using apis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An automation tool uses RESTCONF to configure a Cisco device. The device returns a 404 error for a PUT request. What does this indicate?
The server is overloaded
Why wrong: Overloaded server leads to 503 Service Unavailable.
The request body is malformed
Why wrong: Malformed body leads to 400 Bad Request.
Authentication failed
Why wrong: Authentication failure leads to 401.
The resource does not exist
404 is specifically for not found.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The resource does not exist
A 404 (Not Found) response to a RESTCONF PUT request indicates that the target resource (e.g., a specific YANG data node or URI) does not exist on the device. RESTCONF uses HTTP methods to manipulate resources identified by URIs; a PUT request is intended to create or replace a resource at that URI, but if the resource path is invalid or the data model node is not present, the server returns 404. This is consistent with RFC 8040, which defines the RESTCONF protocol.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The server is overloaded
Why it's wrong here
Overloaded server leads to 503 Service Unavailable.
The request body is malformed
Why it's wrong here
Malformed body leads to 400 Bad Request.
Authentication failed
Why it's wrong here
Authentication failure leads to 401.
The resource does not exist
Why this is correct
404 is specifically for not found.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between HTTP status codes in RESTCONF/NETCONF contexts, and the trap here is that candidates confuse 404 (resource not found) with 400 (bad request) or 401 (authentication failure), especially when the PUT request seems syntactically correct but targets a non-existent resource.
Detailed technical explanation
In RESTCONF, the PUT operation is idempotent and targets a specific resource URI (e.g., /restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet0/1). A 404 error can also occur if the YANG module containing the resource is not loaded on the device, or if the resource path includes a non-existent key leaf value. Real-world scenarios include mistyping the interface name or referencing a data node that is not part of the device's supported YANG models.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Understanding and Using APIs — This question tests Understanding and Using APIs — Read the scenario before looking for a memorised answer..
The correct answer is: The resource does not exist — A 404 (Not Found) response to a RESTCONF PUT request indicates that the target resource (e.g., a specific YANG data node or URI) does not exist on the device. RESTCONF uses HTTP methods to manipulate resources identified by URIs; a PUT request is intended to create or replace a resource at that URI, but if the resource path is invalid or the data model node is not present, the server returns 404. This is consistent with RFC 8040, which defines the RESTCONF protocol.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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