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350-401 Practice Question: Uses the Requests library to query a Cisco IOS-XE…
A network engineer uses the Requests library to query a Cisco IOS-XE device via RESTCONF for interface statistics:
```python
import requests from requests.auth import HTTPBasicAuth
url = 'https://192.168.1.1/restconf/data/Cisco-IOS-XE-interfaces-oper:interfaces/interface=GigabitEthernet1/0/1/statistics' headers = {'Accept': 'application/yang-data+json'} auth = HTTPBasicAuth('admin', 'cisco123') response = requests.get(url, headers=headers, auth=auth, verify=False)
print(response.json())
```
What is the most likely issue with this code?
⚠ Common exam trap
Candidates may overlook the requirement to URL-encode special characters like '/' in RESTCONF URIs and assume the code is correct, leading them to select superficially plausible but incorrect options such as A or C.
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
✓
The interface name 'GigabitEthernet1/0/1' in the URL must be URL-encoded as 'GigabitEthernet1%2F0%2F1'.
The code contains an unencoded slash in the interface name 'GigabitEthernet1/0/1', which is a special character in RESTCONF URIs. It must be URL-encoded as 'GigabitEthernet1%2F0%2F1' to be correctly interpreted as a list key value. Therefore, option B correctly identifies the issue. Option A is false because the URL already includes '/restconf/data/'. Option C is incorrect because 'application/yang-data+json' is the proper Accept header for RESTCONF YANG data. Option D is false because GET is the correct HTTP method for data retrieval.
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 URL is missing the '/data' segment; it should be '/restconf/data/...'
Why it's wrong here
The URL already includes the '/data' segment, so this is not missing.
- ✓
The interface name 'GigabitEthernet1/0/1' in the URL must be URL-encoded as 'GigabitEthernet1%2F0%2F1'.
Why this is correct
The interface name 'GigabitEthernet1/0/1' contains a slash that must be URL-encoded; the code uses the unencoded form, causing the RESTCONF path to be misinterpreted.
- ✗
The Accept header should be 'application/json' instead of 'application/yang-data+json'.
Why it's wrong here
The Accept header 'application/yang-data+json' is appropriate for receiving YANG-modeled data in JSON format from a RESTCONF server.
- ✗
The HTTP method should be POST instead of GET.
Why it's wrong here
A GET request is correct for retrieving data; POST is used for creating or invoking operations.
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Last reviewed: Jul 4, 2026
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