Cisco Certified Internetwork Expert (CCIE) Practice Test

Which option is a data modeling language used to model configuration and state data of network elements?

1. NETCONF

2. RESTCONF

3. YANG

4. SNMPv4

The correct answer is: YANG

The correct choice is YANG, which is a data modeling language specifically designed to model the configuration and state data of network elements. It provides a structured way to define the data formats and types for managing network devices. YANG is often used in conjunction with network management protocols, such as NETCONF and RESTCONF, to facilitate the management of network elements in a standardized manner. By allowing network engineers and developers to define the data schemas for configuration and operational state, YANG enables a clear and consistent approach to network automation and management. It defines how data is represented, which extends to all kinds of device configurations, such as interfaces, routing protocols, and other features of network elements. NETCONF and RESTCONF are protocols that utilize the models defined in YANG to perform data retrieval and management operations but are not data modeling languages themselves. SNMPv4 (Simple Network Management Protocol version 4), while related to network management, does not primarily focus on configuration modeling and is more concerned with monitoring and managing devices.