200-901 Cisco Platforms and Development Practice Question
Which tool can be used to explore YANG models locally?
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
pyang is a tool for validating and converting YANG models.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
yangcatalog.org
Why it's wrong here
yangcatalog.org is a hosted web search service, so it requires internet access and cannot explore models offline. It is tempting because it indexes many vendor YANG modules and is the correct choice when you need to browse published models online rather than on your own machine.
- ✗
Cisco DevNet sandbox
Why it's wrong here
A DevNet sandbox is a remote hosted lab environment, so it is not local and its YANG tooling is limited. It is tempting because sandboxes give free access to real devices for practise, which is correct when you need to test configurations against hardware rather than browse models.
- ✗
Postman
Why it's wrong here
Postman sends and tests HTTP or REST API requests; it has no YANG parser or model browser. It is tempting because Postman is the standard tool for exercising RESTCONF and NETCONF APIs, which is correct once you already know the model and want to send requests.
- ✓
pyang
Why this is correct
pyang is an open-source YANG validator and converter that parses YANG modules locally, letting engineers inspect tree structures, verify syntax and explore model hierarchies without a live device. It directly satisfies the requirement to explore YANG models offline.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.