Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2AutomationMedium
A network engineer is configuring a Cisco IOS XE router to use YANG data models for programmatic configuration. They want to expose a specific subset of the device's configuration and operational data through a NETCONF interface. Which of the following statements accurately describes the role of YANG in this scenario?
- AYANG defines the authentication and authorization mechanisms for NETCONF sessions.
- BYANG is a scripting language used to automate device configurations directly on the router.
- CYANG provides the transport layer for NETCONF messages, typically over SSH.
- DYANG specifies the data structures and constraints for configuration and state data accessible via NETCONF.
Show answer & explanationAnswer & explanation
Correct answer: D. YANG specifies the data structures and constraints for configuration and state data accessible via NETCONF.
YANG (Yet Another Next Generation) is a data modeling language used to define the structure, syntax, and semantics of configuration and state data for network devices. It specifies what data can be accessed and manipulated via protocols like NETCONF and RESTCONF, ensuring consistency and validation.
Why the other options are wrong
- A. NETCONF itself, often leveraging SSH, handles authentication and authorization, not YANG.
- B. YANG is a data modeling language, not a scripting language like Python or EEM; it describes data, it doesn't execute commands.
- C. YANG is a data modeling language, not a transport protocol. NETCONF uses SSH as its secure transport.
YANG Data Modeling Language
A data modeling language used to define the data structures of configuration and state data for network devices, enabling programmatic interaction via protocols like NETCONF and RESTCONF.
- Defines data hierarchy, types, constraints.
- Used by NETCONF and RESTCONF APIs.
- Ensures data consistency and validation.
Memory trick: YANG is the 'blueprint' for network data, defining its 'shape'.