The answer is that YANG models can be augmented to extend existing models, and they are specifically designed to model configuration and state data for NETCONF and RESTCONF. This is correct because YANG, defined in RFC 6020 and updated by RFC 7950, provides a structured, modular language that allows network engineers to define the syntax and semantics of data exchanged over these protocols. The augmentation feature is critical—it lets you add new nodes to an existing YANG module without modifying the original, enabling vendor-specific extensions while maintaining interoperability. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of model-driven automation and how service providers use YANG to standardize device configuration across multivendor environments. A common trap is confusing augmentation with deviation, but remember: augmentation adds, deviation subtracts or modifies constraints. For a quick memory tip, think “augment adds” to keep the distinction clear.
350-501 Automation and Assurance Practice Question
This 350-501 practice question tests your understanding of automation and assurance. 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 statements about YANG data models are true? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
YANG models are used to model data for NETCONF and RESTCONF.
Option D is correct because YANG (RFC 6020/7950) is a data modeling language specifically designed to model configuration and state data for network management protocols like NETCONF and RESTCONF. YANG defines the structure, constraints, and semantics of data that can be exchanged via these protocols, making it the standard for model-driven network automation.
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 can be directly converted to SNMP MIBs.
Why it's wrong here
YANG and SNMP MIBs are different; conversion is not direct.
✗
YANG models define only configuration data, not state data.
Why it's wrong here
YANG models define both config and state data.
✗
YANG models define CLI commands.
Why it's wrong here
YANG models define data, not CLI commands.
✓
YANG models are used to model data for NETCONF and RESTCONF.
Why this is correct
YANG is the data modeling language for NETCONF/RESTCONF.
Related concept
Read the scenario before looking for a memorised answer.
✓
YANG models can be augmented to extend existing models.
Why this is correct
Augmentation is a key feature of YANG.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that YANG is only for configuration data, but candidates must remember that YANG explicitly supports both config and state data via the 'config false' statement.
Trap categories for this question
Command / output trap
YANG models define data, not CLI commands.
Detailed technical explanation
How to think about this question
YANG models use a tree structure with nodes that can be augmented via the 'augment' statement (RFC 7950, Section 7.17), allowing vendors or standards bodies to extend existing models without modifying the original. For example, the IETF interfaces model (RFC 8343) can be augmented by a vendor to add proprietary interface parameters. This extensibility is critical for multi-vendor environments where base models need customization.
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 practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Automation and Assurance — This question tests Automation and Assurance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: YANG models are used to model data for NETCONF and RESTCONF. — Option D is correct because YANG (RFC 6020/7950) is a data modeling language specifically designed to model configuration and state data for network management protocols like NETCONF and RESTCONF. YANG defines the structure, constraints, and semantics of data that can be exchanged via these protocols, making it the standard for model-driven network automation.
What should I do if I get this 350-501 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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