200-901 Infrastructure and Automation Practice Question
Which THREE are benefits of using YANG as a data modeling language for network automation? (Select exactly 3.)
⚠ Common exam trap
Cisco often tests the distinction between the data modeling language (YANG) and the transport protocols (NETCONF/RESTCONF) or serialization formats (JSON/XML), so the trap here is confusing the benefits of the model itself with the features of the protocols that use it.
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
✓
Enables validation of data constraints before applying changes
YANG (RFC 6020/7950) allows you to define data constraints such as ranges, mandatory elements, and type restrictions directly in the model. When you attempt to apply configuration via NETCONF or RESTCONF, the server validates the data against these constraints before committing, preventing invalid changes from being applied.
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