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200-901 Infrastructure and Automation Practice Question
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 THREE are benefits of using YANG as a data modeling language for network automation? (Select exactly 3.)
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
✓
Enables validation of data constraints before applying changes
Option A is correct because YANG (RFC 6020/7950) allows you to define data constraints such as ranges, mandatory elements, and type restrictions directly in the model. When you attempt to apply configuration via NETCONF or RESTCONF, the server validates the data against these constraints before committing, preventing invalid changes from being applied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the data modeling language (YANG) and the transport protocols (NETCONF/RESTCONF) or serialization formats (JSON/XML), so the trap here is confusing the benefits of the model itself with the features of the protocols that use it.
Detailed technical explanation
How to think about this question
YANG models define a hierarchical tree of nodes with precise data types (e.g., uint32, enumeration, leaf-list) and constraints (e.g., 'mandatory true', 'range 1..100'). When a NETCONF client sends an <edit-config> operation, the server validates the XML payload against the YANG schema before applying it, using constructs like 'when' and 'must' statements for cross-node validation. In a real-world scenario, this prevents a network engineer from accidentally setting an MTU value outside the allowed range on a router interface, avoiding a potential outage.
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 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
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.
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FAQ
Questions learners often ask
What does this 200-901 question test?
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enables validation of data constraints before applying changes — Option A is correct because YANG (RFC 6020/7950) allows you to define data constraints such as ranges, mandatory elements, and type restrictions directly in the model. When you attempt to apply configuration via NETCONF or RESTCONF, the server validates the data against these constraints before committing, preventing invalid changes from being applied.
What should I do if I get this 200-901 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.
About these practice questions
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Last reviewed: Jun 24, 2026
This 200-901 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 200-901 exam.
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