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350-401 Practice Question: Which two statements about YANG data models and…
Which two statements about YANG data models and their role in model-driven telemetry are true? (Choose two.)
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 is a data modeling language used to define the structure of configuration and operational state data.
YANG models define the structure and constraints of data that can be streamed via telemetry. Native models are vendor-specific, while OpenConfig models are vendor-neutral. IETF models are standards-based but not necessarily vendor-neutral. YANG is a data modeling language, not a transport protocol. Telemetry subscriptions reference YANG paths to specify which data to stream.
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 is a data modeling language used to define the structure of configuration and operational state data.
Why this is correct
Correct because YANG (RFC 7950) is indeed a data modeling language for defining data structures, which are then used by telemetry to stream operational state.
- ✗
OpenConfig YANG models are vendor-specific and only supported on Cisco devices.
Why it's wrong here
Incorrect because OpenConfig models are vendor-neutral, designed to work across multiple vendors, not just Cisco.
- ✓
Native YANG models are developed by the device vendor and may expose platform-specific features.
Why this is correct
Correct because native models (e.g., Cisco IOS-XE native) are vendor-specific and can expose unique hardware or software capabilities not covered by standard models.
- ✗
IETF YANG models are the only models that can be used for model-driven telemetry subscriptions.
Why it's wrong here
Incorrect because telemetry subscriptions can use any YANG model—native, OpenConfig, or IETF—as long as the device supports it.
- ✗
YANG is a transport protocol used to stream telemetry data from network devices to collectors.
Why it's wrong here
Incorrect because YANG is a data modeling language, not a transport protocol. Telemetry data is transported using protocols like gRPC, HTTP/2, or UDP.
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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which two statements about YANG data models in model-driven telemetry are true? (Choose two.)
medium- ✓ A.YANG models are used to define the data structures streamed in telemetry subscriptions.
- ✓ B.OpenConfig YANG models are vendor-neutral and supported across multiple network operating systems.
- C.Native YANG models are standardized by the IETF and used universally.
- D.NETCONF is a YANG data model used for telemetry configuration.
- E.RESTCONF provides a YANG-based data model for streaming telemetry.
Why A: YANG models define the structure and constraints of telemetry data. Native models are vendor-specific, while OpenConfig models are standardized. IETF models are also standards-based but not vendor-specific. NETCONF uses YANG but is not a data model. RESTCONF is a protocol, not a model.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.