200-901 Cisco Platforms and Development Practice Question
A network engineer is planning to use model-driven programmability with YANG models. Which three statements about YANG models are correct?
⚠ Common exam trap
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.
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.
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.
- ✓
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.
- ✓
yangcatalog.org is an online repository of YANG models.
Why this is correct
Correct. yangcatalog.org is a public repository for YANG modules.
- ✗
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.
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