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200-901 Practice Question: Which TWO of the following are characteristics of…
Which TWO of the following are characteristics of Model-Driven Programmability with YANG models?
⚠ Common exam trap
Cisco often tests the misconception that YANG models are tied to a single protocol or encoding format, leading candidates to incorrectly associate YANG exclusively with NETCONF or JSON.
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
✓
YANG models define a hierarchical data tree.
YANG models define a hierarchical data tree structure that organizes configuration and state data in a parent-child relationship, mirroring the structure of the device's operational and configuration data. This hierarchical representation allows for precise, path-based access to individual data nodes, which is fundamental to model-driven programmability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
YANG models define a hierarchical data tree.
Why this is correct
YANG models represent data as a tree structure.
- ✗
YANG models are only used with the Python library ncclient.
Why it's wrong here
ncclient is one tool, not exclusive.
- ✓
NETCONF and RESTCONF use YANG models to manipulate device configurations.
Why this is correct
Both protocols rely on YANG for data modeling.
- ✗
The controller directly pushes configurations to network devices without validation.
Why it's wrong here
YANG models enable validation before pushing.
- ✗
NETCONF requires JSON encoding for configuration data.
Why it's wrong here
NETCONF uses XML, not JSON.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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