YANG is a data modeling language standardized by the IETF and used to define structured data for network configuration, state data, Remote Procedure Calls (RPCs), and notifications. It is primarily used in network management and automation frameworks to model the behavior and structure of network elements such as routers, switches, and firewalls.
YANG models are typically used with the NETCONF and RESTCONF protocols, enabling programmatic access and manipulation of device configurations. The language supports hierarchical data structures, data type definitions, constraints, and protocol-independent modeling, making it a key component in modern software-defined networking (SDN) and network function virtualization (NFV) environments.
- Defines configuration and operational state data for network devices
- Used with NETCONF and RESTCONF for network automation
- Supports modular and reusable data models
- Enables vendor-neutral network management
- Integrated into orchestration and management systems like OpenDaylight and ONOS
Professionals with YANG expertise are typically network engineers, automation specialists, or systems architects working in telecommunications, cloud infrastructure, or enterprise networking. They are expected to design, implement, and maintain YANG data models, validate model correctness, and integrate models with network management systems. Knowledge of related technologies such as YIN (YANG's XML representation), XPath, and data encoding formats like JSON and XML is commonly required. Mastery of YANG supports efficient, scalable, and standardized network operations in complex, multi-vendor environments.