200-901 Infrastructure and Automation Practice Question
A network engineer attempts to use RESTCONF to retrieve the running configuration of a Cisco IOS XE device. The GET request to '/restconf/data/Cisco-IOS-XE-native:native' returns a 405 Method Not Allowed error. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the distinction between HTTP status codes (405 vs. 401 vs. 400) to see if candidates understand that 405 specifically relates to an unsupported HTTP method or disabled service, not authentication or malformed data.
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
✓
RESTCONF is not enabled or the YANG module is not supported.
A 405 Method Not Allowed error indicates that the HTTP method (GET) is not supported for the requested resource. In RESTCONF, this typically occurs when the RESTCONF service is not enabled on the device or the specific YANG module (Cisco-IOS-XE-native) is not supported or loaded. Without the service or module, the server cannot process the GET request for the running configuration.
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 key provided is invalid.
Why it's wrong here
Invalid API key would give 401 or 403.
- ✗
The request body was malformed.
Why it's wrong here
GET requests don't have a body.
- ✓
RESTCONF is not enabled or the YANG module is not supported.
Why this is correct
RESTCONF must be enabled and the module accessible.
- ✗
The device does not support HTTPS.
Why it's wrong here
HTTPS support is required but 405 indicates method not allowed, not SSL.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.