This 200-901 practice question tests your understanding of infrastructure and 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.
Which tool is specifically designed for model-driven programmability using YANG data models?
NETCONF
NETCONF is a protocol designed for model-driven management with YANG.
SNMP
Why wrong: SNMP is an older protocol, not model-driven with YANG.
CLI
Why wrong: CLI is command-line interface, not model-driven.
Ansible
Why wrong: Ansible is an automation tool that can use YANG but is not specifically designed for it.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NETCONF
NETCONF is the correct answer because it is a network management protocol specifically designed to operate with YANG data models, using XML or JSON encoding to transport configuration and state data. YANG defines the structure of the data, and NETCONF provides the operations (get, edit-config, etc.) to manipulate that data in a model-driven, programmatic way. This makes NETCONF the standard tool for model-driven programmability in modern network automation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
NETCONF
Why this is correct
NETCONF is a protocol designed for model-driven management with YANG.
Related concept
Read the scenario before looking for a memorised answer.
SNMP
Why it's wrong here
SNMP is an older protocol, not model-driven with YANG.
CLI
Why it's wrong here
CLI is command-line interface, not model-driven.
Ansible
Why it's wrong here
Ansible is an automation tool that can use YANG but is not specifically designed for it.
Common exam traps
Cisco often tests the distinction between a protocol that natively uses YANG (NETCONF) versus tools that can work with YANG but are not designed specifically for it (like Ansible), so the trap here is assuming any automation tool that supports YANG qualifies as 'specifically designed' for model-driven programmability.
Trap categories for this question
Command / output trap
CLI is command-line interface, not model-driven.
Detailed technical explanation
Under the hood, NETCONF uses a remote procedure call (RPC) paradigm over SSH (RFC 6242) to exchange XML-encoded messages that directly correspond to YANG-defined data trees. A subtle behavior is that NETCONF supports candidate configurations and confirmed commits, allowing atomic rollback of changes—a feature not available in SNMP or CLI. In a real-world scenario, a network engineer might use NETCONF with YANG to push a consistent VLAN configuration across hundreds of switches, ensuring compliance with a centralized data model.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: NETCONF — NETCONF is the correct answer because it is a network management protocol specifically designed to operate with YANG data models, using XML or JSON encoding to transport configuration and state data. YANG defines the structure of the data, and NETCONF provides the operations (get, edit-config, etc.) to manipulate that data in a model-driven, programmatic way. This makes NETCONF the standard tool for model-driven programmability in modern network automation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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