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What is the role of a YANG model in network programmability?

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What is the role of a YANG model in network programmability?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Best answer

It provides a structured way to model configuration and state data

Correct. Modeling data is exactly what YANG is for.

B

Distractor review

It encrypts API payloads between a client and server

Encryption is handled by transport and security protocols, not by YANG itself.

C

Distractor review

It replaces JSON as a transport protocol

YANG is not a transport protocol and does not replace JSON directly.

D

Distractor review

It assigns VLAN IDs dynamically to trunks

YANG may describe data related to VLANs, but it does not dynamically assign VLAN IDs by itself.

Common exam trap

Common exam trap: answer the scenario, not the keyword

A frequent exam trap is mistaking YANG for a security or transport protocol. Some candidates incorrectly believe YANG encrypts API payloads or replaces JSON as a transport protocol. In reality, YANG is solely a data modeling language that defines how configuration and state data are structured. Encryption is handled by protocols like SSH or TLS, and transport formats like JSON or XML carry the data modeled by YANG. Confusing these roles can lead to selecting incorrect answers about YANG’s function in network programmability.

Technical deep dive

How to think about this question

YANG is a data modeling language specifically designed for network programmability, enabling network engineers to define the structure of configuration and operational state data in a standardized, hierarchical format. It provides a clear schema that describes how data is organized, what types of data are allowed, and the relationships between data elements. This structured approach allows automation tools and network management protocols like NETCONF and RESTCONF to interact with network devices in a consistent and predictable manner. In the context of Cisco networking and the CCNA 200-301 exam, YANG models serve as the blueprint for how network configurations and states are represented programmatically. When using protocols such as NETCONF or RESTCONF, these models ensure that the data exchanged between the network management system and devices adheres to a defined structure, reducing errors and improving automation reliability. This is crucial for managing complex network environments where manual configuration is error-prone and inefficient. A common exam trap is confusing YANG’s role with transport or security functions. YANG does not handle encryption, nor does it replace transport protocols like JSON or XML; instead, it defines the data structure that these protocols carry. Practically, YANG models enable network programmability by providing a vendor-neutral, extensible way to represent network configurations and states, which is essential for modern network automation and programmability strategies.

KKey Concepts to Remember

  • YANG defines a standardized, hierarchical schema to model network device configuration and operational state data for automation.
  • Protocols like NETCONF and RESTCONF use YANG models to ensure consistent and structured communication with network devices.
  • YANG models enable vendor-neutral programmability by providing a clear blueprint for network data representation.
  • YANG does not perform encryption or transport data but defines the structure of data carried by protocols such as JSON or XML.
  • Using YANG models reduces configuration errors by enforcing data validation and consistency in automated network management.
  • YANG supports extensibility, allowing network engineers to customize models for specific Cisco device features or network requirements.
  • Understanding YANG’s role is critical for implementing modern network automation strategies covered in the CCNA exam.
  • YANG models facilitate interoperability between different network management tools and devices by standardizing data representation.

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.

Related practice questions

Related 200-301 practice-question pages

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?

Question 2

A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?

Question 3

What is the OSPF metric called?

Question 4

A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?

Question 5

A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?

Question 6

A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?

FAQ

Questions learners often ask

What does this 200-301 question test?

YANG defines a standardized, hierarchical schema to model network device configuration and operational state data for automation.

What is the correct answer to this question?

The correct answer is: It provides a structured way to model configuration and state data — YANG is a data modeling language used to define structured representations of configuration and operational data. Protocols such as NETCONF and RESTCONF can use those models to read or manipulate network state.

What should I do if I get this 200-301 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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