hardMultiple ChoiceObjective-mapped
200-901 Practice Question: An automation script uses the Cisco IOS XE REST…
An automation script uses the Cisco IOS XE REST API to modify the running configuration. The script sends a PUT request to /restconf/data/Cisco-IOS-XE-native:native/interface/GigabitEthernet=1/0/1/ip/address. The response returns 405 Method Not Allowed. What is the most likely reason?
⚠ Common exam trap
Cisco often tests the distinction between PUT and PATCH in RESTCONF, where candidates mistakenly assume PUT is always allowed for modifications, but the trap is that PUT requires full resource replacement and is often blocked on nested or list-based resources, making PATCH the correct choice for partial updates.
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
✓
PUT is not allowed on this resource; use PATCH instead.
The 405 Method Not Allowed response indicates that the HTTP method (PUT) is recognized but not supported for the specific resource. In RESTCONF, PUT is used for full resource replacement, but Cisco IOS XE often restricts PUT on certain configuration resources like interface IP addresses because they are nested leafs or lists that require partial updates. PATCH is the correct method for modifying specific fields without replacing the entire resource, aligning with RFC 8040 for partial resource modifications.
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 request body is missing.
Why it's wrong here
Missing body would be 400.
- ✓
PUT is not allowed on this resource; use PATCH instead.
Why this is correct
RESTCONF often uses PATCH for partial updates; PUT might not be implemented.
- ✗
The interface does not exist.
Why it's wrong here
This would return 404.
- ✗
The script is not authenticated.
Why it's wrong here
Authentication issues return 401.
- ✗
The IP address format is incorrect.
Why it's wrong here
Format issues usually return 400.
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Senior Network & Security Engineer · founder of Courseiva
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