200-901 Cisco Platforms and Development Practice Question

Which tool is used to explore and validate YANG models?

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 Python-based tool for validating and converting YANG models.

Answer analysis

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Postman
Why it's wrong here
Postman sends and inspects HTTP API requests; it has no YANG parser, so it cannot resolve imports, check leafref targets or validate module structure. It is tempting because RESTCONF exposes YANG-modeled data over HTTP; that would be correct for exercising RESTCONF endpoints, not for exploring or validating the model.
✗
cURL
Why it's wrong here
cURL transfers data over HTTP, FTP and similar protocols; it cannot parse YANG module syntax or validate leaf, type and constraint definitions. It is tempting because YANG models are exchanged over NETCONF or RESTCONF, which cURL can call; that would be correct for sending RPCs, not for exploring or validating the model itself.
✗
YANGman
Why it's wrong here
YANGman is not a real YANG tool; no such utility parses modules or validates their syntax. It is tempting because the name resembles yanglint and pyang, the actual validators, so it looks like a plausible vendor offering; the correct answer names one of those genuine tools.
✓
pyang
Why this is correct
pyang parses YANG modules, validates their syntax and semantics against RFC rules, and can render tree diagrams, making it the standard tool for exploring and validating YANG models. It directly satisfies the requirement to check model correctness.

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