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.
A network automation solution uses YANG data models to describe network configurations. Which THREE statements about YANG are true? (Select THREE)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
YANG can be used in conjunction with NETCONF and RESTCONF.
YANG is a data modeling language that defines the structure and constraints of configuration and state data, and it is designed to be used with NETCONF (RFC 6241) and RESTCONF (RFC 8040) as the transport protocols. This makes option A correct because YANG models are encoded in XML or JSON and exchanged via these protocols.
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.
✓
YANG can be used in conjunction with NETCONF and RESTCONF.
Why this is correct
Both protocols use YANG models.
Related concept
Read the scenario before looking for a memorised answer.
✗
YANG models are always written in XML syntax.
Why it's wrong here
YANG has its own syntax, not XML; models can be translated to XML.
✓
YANG is used to define both configuration and state data.
Why this is correct
YANG models can represent both config and operational state.
Related concept
Read the scenario before looking for a memorised answer.
✓
YANG is a data modeling language used to define the structure of data.
Why this is correct
YANG models define the schema for data.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that YANG is tied to a specific encoding (like XML) or that it replaces SNMP entirely, when in fact YANG is encoding-agnostic and complements SNMP by providing structured, transactional configuration management.
Detailed technical explanation
How to think about this question
YANG models define a hierarchical tree of nodes, each with a specific data type (e.g., string, uint32, leaf-list) and constraints like mandatory or default values. In a real-world scenario, a network engineer might use a YANG model to define an ACL, then push it via NETCONF using an <edit-config> operation, ensuring transactional consistency (all-or-nothing) that SNMP lacks.
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.
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: YANG can be used in conjunction with NETCONF and RESTCONF. — YANG is a data modeling language that defines the structure and constraints of configuration and state data, and it is designed to be used with NETCONF (RFC 6241) and RESTCONF (RFC 8040) as the transport protocols. This makes option A correct because YANG models are encoded in XML or JSON and exchanged via these protocols.
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.
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Question Discussion
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