CCNA AI and Network Operations Practice Question
A controller exposes a YANG-modeled interface configuration through an API. Which two statements correctly describe the purpose of YANG in that workflow?
⚠ Common exam trap
A frequent exam trap is mistaking YANG for a network protocol or function rather than a data modeling language. For example, options suggesting YANG replaces IP addressing or optimizes spanning-tree protocols are incorrect because YANG does not perform routing or Layer 2 operations. Candidates might confuse YANG’s role with actual network services instead of recognizing it as a schema that defines how configuration and state data are structured and exchanged. This misunderstanding can lead to selecting incorrect answers that describe network functions rather than data modeling purposes.
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
✓
It provides a structured data model for configuration and operational data
YANG is a modeling language. It defines the structure of network data so controllers and devices can exchange information consistently through APIs such as RESTCONF or NETCONF.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It provides a structured data model for configuration and operational data
Why this is correct
YANG defines a hierarchical, tree-like schema that organizes both configuration data (intended state) and operational state data (actual state) for network devices. This structured model enables programmatic access and automation, as APIs like NETCONF/RESTCONF use YANG to validate and manipulate the data. It provides a clear, machine-readable representation of what a device can do and how its configuration is structured.
- ✓
It helps standardize how network elements represent managed data
Why this is correct
YANG establishes a common, vendor-neutral data modeling language that standardizes how network elements represent managed data, reducing proprietary differences. This allows management systems and controllers to interact with devices from multiple vendors using a unified set of models. It is a foundational element of model-driven programmability, enabling consistent representation of concepts like interfaces, routing protocols, and QoS policies.
- ✗
It replaces IP addressing on routed interfaces
Why it's wrong here
YANG is a data modeling language, not a protocol or mechanism that assigns IP addresses. It describes the structure and constraints of configuration data, but the actual IP addressing is applied via network protocols (e.g., DHCP, static configuration) and resides in the device's running configuration. Thus, YANG cannot replace IP addressing; it merely provides a standardized way to read/write that configuration.
When this WOULD be correct
In a question about network automation tools that directly configure IP addresses on interfaces, an option stating 'It replaces IP addressing on routed interfaces' could be correct if the tool (e.g., a controller using YANG) abstracts away manual IP configuration, but YANG alone does not replace IP addressing.
- ✗
It is a spanning-tree optimization mechanism
Why it's wrong here
Spanning Tree Protocol (STP) is a Layer 2 loop-prevention mechanism, entirely separate from YANG. YANG has no role in detecting or preventing network loops; it only provides a structured way to configure and monitor STP parameters if the device supports it. Therefore, equating YANG with a spanning-tree optimization mechanism confuses data modeling with a specific network function.
When this WOULD be correct
In a question about spanning-tree enhancements, an option describing a mechanism that optimizes spanning-tree convergence (e.g., 'It is a spanning-tree optimization mechanism') could be correct if referring to a feature like PortFast, UplinkFast, or BackboneFast.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓It provides a structured data model for configuration and operational dataCorrect answer▾
Why this is correct
YANG defines a hierarchical, tree-like schema that organizes both configuration data (intended state) and operational state data (actual state) for network devices. This structured model enables programmatic access and automation, as APIs like NETCONF/RESTCONF use YANG to validate and manipulate the data. It provides a clear, machine-readable representation of what a device can do and how its configuration is structured.
✗It replaces IP addressing on routed interfacesWrong answer — click to see why▾
Why this is wrong here
YANG is a data modeling language for configuration and operational data, not a protocol or mechanism that replaces IP addressing on interfaces. IP addressing is configured via the data model, but YANG itself does not replace it.
★ When this WOULD be the correct answer
In a question about network automation tools that directly configure IP addresses on interfaces, an option stating 'It replaces IP addressing on routed interfaces' could be correct if the tool (e.g., a controller using YANG) abstracts away manual IP configuration, but YANG alone does not replace IP addressing.
Why candidates choose this
Candidates may confuse YANG with a configuration protocol that directly sets IP addresses, or think that because YANG models interface configuration, it somehow replaces the need for IP addressing itself.
✗It is a spanning-tree optimization mechanismWrong answer — click to see why▾
Why this is wrong here
YANG is a data modeling language for network configuration and state data, not a spanning-tree optimization mechanism. Spanning-tree optimization is handled by protocols like RSTP or MST, not by YANG.
★ When this WOULD be the correct answer
In a question about spanning-tree enhancements, an option describing a mechanism that optimizes spanning-tree convergence (e.g., 'It is a spanning-tree optimization mechanism') could be correct if referring to a feature like PortFast, UplinkFast, or BackboneFast.
Why candidates choose this
Candidates may confuse YANG with other network technologies or assume any 'optimization' term relates to YANG, especially if they have limited understanding of YANG's role in model-driven programmability.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Agentic AI in Network Operations
Key term
API
An API is a set of rules that allows software applications to communicate and exchange data with each other.
Key term
NETCONF
NETCONF is a network management protocol that allows administrators to configure, retrieve, and delete settings on network devices using a structured, machine-readable data format.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.