350-601 Automation Practice Question
A network team is planning to automate configuration management of a brownfield Nexus 9000 fabric using YANG data models and NETCONF. Which consideration is critical when implementing this solution?
⚠ Common exam trap
Cisco often tests the misconception that NETCONF is a complete CLI replacement, but the trap here is that operational state modeling against device-specific YANG is critical for drift detection in brownfield environments, not just configuration push.
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 operational state must be modeled against the device-specific YANG model to avoid configuration drift.
In a brownfield Nexus 9000 fabric, the operational state (e.g., interface status, routing table) must be modeled against the device-specific YANG model to detect and correct configuration drift. NETCONF uses YANG models to define both configuration and operational data, but only the device-specific native model accurately reflects the actual running state. Without this alignment, automated remediation may push incorrect configurations, leading to network instability.
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 operational state must be modeled against the device-specific YANG model to avoid configuration drift.
Why this is correct
In brownfield, understanding the current state via YANG is needed to plan incremental changes and avoid drift.
- ✗
NETCONF replaces CLI entirely; no fallback necessary.
Why it's wrong here
NETCONF may not cover all features; a fallback to CLI or NX-API is often needed.
- ✗
Using NETCONF for configuration ensures zero touch provisioning.
Why it's wrong here
ZTP is separate; NETCONF alone does not provide zero-touch.
- ✗
All NX-OS versions support the same YANG models; no compatibility check needed.
Why it's wrong here
Different NX-OS versions support different YANG models; compatibility must be verified.
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