The correct answer is that NETCONF and RESTCONF use YANG models to manipulate device configurations. This is because YANG models define a hierarchical data tree structure that organizes configuration and state data in a parent-child relationship, mirroring the device’s actual operational and configuration state. This hierarchical representation allows for precise, path-based access to individual data nodes, which is the foundation of model-driven programmability. On the Cisco DevNet Associate 200-901 exam, this concept tests your understanding of how YANG provides a structured, schema-driven approach to data modeling, distinguishing it from flat or unstructured data formats. A common trap is confusing YANG as a protocol itself rather than a data modeling language; remember that YANG defines the tree, while NETCONF and RESTCONF are the protocols that traverse it. Memory tip: think of YANG as the blueprint for a tree, and NETCONF/RESTCONF as the tools that climb its branches to read or change leaves.
200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are characteristics of Model-Driven Programmability with YANG models?
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.
Option A is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
YANG (RFC 7950) models define data nodes using 'container', 'list', 'leaf', and 'leaf-list' statements, creating a tree that can be navigated via XPath-like expressions. In NETCONF, operations like <edit-config> validate the XML payload against the YANG schema before applying changes, ensuring data integrity. A real-world scenario is automating VLAN configuration on a Cisco IOS XE device, where the YANG model defines the VLAN hierarchy, and NETCONF validates the XML payload before committing the change.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: YANG models define a hierarchical data tree. — Option A is correct because 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.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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