- A
pyang is a tool that can be used to explore YANG models.
Correct. pyang can parse and display YANG models.
- B
Cisco native YANG models are defined by Cisco and often have more detailed features.
Correct. Cisco native models are Cisco-specific and provide more details.
- C
yangcatalog.org is an online repository of YANG models.
Correct. yangcatalog.org is a public repository for YANG modules.
- D
OpenConfig models are vendor-specific.
Why wrong: OpenConfig models are vendor-neutral standard models.
- E
YANG models are only used with NETCONF, not RESTCONF.
Why wrong: YANG models are used with both NETCONF and RESTCONF.
Question 415 of 1,000
200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. 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 engineer is planning to use model-driven programmability with YANG models. Which three statements about YANG models are correct?
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
✓
pyang is a tool that can be used to explore YANG models.
A is correct because pyang is a command-line tool that validates and converts YANG models into various formats (e.g., tree, UML, YIN), enabling engineers to explore the structure and semantics of YANG modules. It is widely used in network automation workflows to inspect model hierarchies and dependencies before implementing NETCONF or RESTCONF configurations.
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.
- ✓
pyang is a tool that can be used to explore YANG models.
Why this is correct
Correct. pyang can parse and display YANG models.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Cisco native YANG models are defined by Cisco and often have more detailed features.
Why this is correct
Correct. Cisco native models are Cisco-specific and provide more details.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
yangcatalog.org is an online repository of YANG models.
Why this is correct
Correct. yangcatalog.org is a public repository for YANG modules.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
OpenConfig models are vendor-specific.
Why it's wrong here
OpenConfig models are vendor-neutral standard models.
- ✗
YANG models are only used with NETCONF, not RESTCONF.
Why it's wrong here
YANG models are used with both NETCONF and RESTCONF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between vendor-specific (Cisco native) and vendor-neutral (OpenConfig) YANG models, and the trap here is assuming OpenConfig is vendor-specific because it is often associated with Cisco devices, when in fact it is an open standard.
Detailed technical explanation
How to think about this question
YANG (RFC 7950) defines a hierarchical data model that can be serialized in XML or JSON, and both NETCONF and RESTCONF use YANG to describe the structure of configuration and state data. pyang can output a 'tree' representation that shows the exact paths and data types, which is critical when writing automation scripts that must match the model's exact node names and constraints. In real-world deployments, engineers use pyang to validate custom YANG modules before loading them onto devices to avoid schema mismatches.
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?
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: pyang is a tool that can be used to explore YANG models. — A is correct because pyang is a command-line tool that validates and converts YANG models into various formats (e.g., tree, UML, YIN), enabling engineers to explore the structure and semantics of YANG modules. It is widely used in network automation workflows to inspect model hierarchies and dependencies before implementing NETCONF or RESTCONF configurations.
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: Jul 4, 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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