The critical consideration is that the operational state must be modeled against the device-specific YANG model to avoid configuration drift. In a brownfield Nexus 9000 fabric, NETCONF retrieves both configuration and operational data, but only the device-specific native YANG model accurately reflects the actual running state of interfaces, routing tables, and other dynamic parameters. Without this alignment, automated remediation based on a generic or open-config model may push incorrect configurations, causing network instability. On the Cisco DCCOR 350-601 exam, this tests your understanding of brownfield automation challenges—a common trap is assuming any YANG model works equally well for operational state reconciliation. Remember the memory tip: "Native model for state, open model for intent"—always validate operational data against the device’s native YANG model to prevent drift.
350-601 Automation Practice Question
This 350-601 practice question tests your understanding of 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 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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
NETCONF (RFC 6241) uses YANG (RFC 7950) as a data modeling language, where device-specific native YANG models expose both <config> and <operational> datastores. In brownfield deployments, the <operational> datastore reflects the actual device state, which may diverge from the intended configuration due to manual CLI changes, software upgrades, or hardware failures. Comparing the operational state against the native YANG model allows tools like Ansible or NSO to perform drift detection and reconciliation, ensuring the fabric remains compliant.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Automation — This question tests Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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