Quick Answer
The answer is 204 No Content. When a RESTCONF PATCH request successfully modifies a resource on a Cisco IOS-XE device, the standard HTTP response code is 204, indicating that the server has fulfilled the request but does not need to return a message body. This aligns with RESTCONF’s design for idempotent update operations, where the resource is altered in place and no representation is sent back in the response. On the ENCOR 350-401 exam, this concept tests your understanding of RESTCONF response semantics versus other methods like POST (which returns 201 Created) or GET (which returns 200 OK). A common trap is assuming PATCH returns 200 with the updated data, but the standard is 204 — some implementations may deviate, but Cisco expects the official behavior. For a memory tip, think “PATCH = 204, no payload back” — the server patches silently, so you get no content.
This 350-401 practice question tests your understanding of python for network automation. 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.
A network engineer uses the Requests library to send a RESTCONF PATCH request to modify the hostname of a Cisco IOS-XE device:
```python
import requests from requests.auth import HTTPBasicAuth
url = 'https://192.168.1.1/restconf/data/Cisco-IOS-XE-native:native/hostname' headers = {'Content-Type': 'application/yang-data+json'} auth = HTTPBasicAuth('admin', 'cisco123') payload = { 'Cisco-IOS-XE-native:hostname': 'NewRouter'
}
response = requests.patch(url, json=payload, headers=headers, auth=auth, verify=False)
print(response.status_code)
```
What is the expected HTTP status code if the request is successful?
200 OK
Why wrong: While possible, the standard RESTCONF response for PATCH is 204 No Content.
201 Created
Why wrong: 201 is for POST when a new resource is created.
204 No Content
RESTCONF PATCH returns 204 on success.
202 Accepted
Why wrong: 202 is for asynchronous operations, not typical for PATCH.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
204 No Content
In RESTCONF, a successful PATCH request returns 204 No Content, as the resource is modified and no content is returned in the response body. Some implementations may return 200, but the standard is 204.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
200 OK
Why it's wrong here
While possible, the standard RESTCONF response for PATCH is 204 No Content.
201 Created
Why it's wrong here
201 is for POST when a new resource is created.
204 No Content
Why this is correct
RESTCONF PATCH returns 204 on success.
Related concept
Static NAT maps one inside address to one outside address.
202 Accepted
Why it's wrong here
202 is for asynchronous operations, not typical for PATCH.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Python for Network Automation — This question tests Python for Network Automation — Static NAT maps one inside address to one outside address..
The correct answer is: 204 No Content — In RESTCONF, a successful PATCH request returns 204 No Content, as the resource is modified and no content is returned in the response body. Some implementations may return 200, but the standard is 204.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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