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350-401 Practice Question: Uses the following Python code to subscribe to…
A network engineer uses the following Python code to subscribe to telemetry data from a Cisco IOS-XE device via NETCONF using the YANG module 'Cisco-IOS-XE-mdt-oper':
```python
from ncclient import manager
m = manager.connect( host='192.168.1.1', port=830,
username='admin',
password='cisco', hostkey_verify=False )
# Create a telemetry subscription
subscription = ''' <config> <mdt-config-data xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-mdt-cfg"> <mdt-subscription> <subscription-id>400</subscription-id> <base> <stream>yang-push</stream> <encoding>encode-kvgpb</encoding> <period>5000</period> <xpath>/interfaces/interface/state/counters</xpath> </base> <mdt-receivers> <address>10.1.1.100</address> <port>50051</port> <protocol>grpc-tcp</protocol> </mdt-receivers> </mdt-subscription> </mdt-config-data> </config> '''
reply = m.edit_config(target='running', config=subscription)
print(reply.xml)
m.close_session() ```
What is the issue with this code?
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 code uses target='running' which may not be writable; it should use target='candidate' and then commit.
The NETCONF edit-config operation with target='running' is used to directly modify the running configuration. However, on many Cisco IOS-XE devices, the running configuration is not directly writable via NETCONF; you must use target='candidate' and then commit. Additionally, the XML namespace for mdt-config-data may be incorrect; the correct namespace is 'http://cisco.com/ns/yang/Cisco-IOS-XE-mdt-cfg' but the module name is 'Cisco-IOS-XE-mdt-cfg'. However, the primary issue is that the code uses target='running' instead of target='candidate' and a separate commit operation.
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 code uses target='running' which may not be writable; it should use target='candidate' and then commit.
Why this is correct
IOS-XE NETCONF typically requires candidate configuration and commit.
- ✗
The XML namespace is incorrect; it should be 'http://cisco.com/ns/yang/Cisco-IOS-XE-mdt-oper'.
Why it's wrong here
The namespace is for configuration, not operational data.
- ✗
The xpath is invalid; it should be '/interfaces/interface/state/counters'.
Why it's wrong here
The xpath is correct for OpenConfig counters.
- ✗
The subscription-id should be a string, not an integer.
Why it's wrong here
The YANG model defines subscription-id as an integer.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.