350-501 · Question #142
How does model-driven telemetry use YANG?
The correct answer is C. to subscribe to data that is streamed from a device. Model-driven telemetry leverages YANG to define the data structures that allow clients to subscribe to and receive specific operational data streams from network devices in real-time.
Question
How does model-driven telemetry use YANG?
Options
- Ato reset network devices that malfunction
- Bto set informs and traps on clients to report back to a centralized server
- Cto subscribe to data that is streamed from a device
- Dto poll network devices on a 30-minute interval
How the community answered
(35 responses)- A3% (1)
- B3% (1)
- C94% (33)
Why each option
Model-driven telemetry leverages YANG to define the data structures that allow clients to subscribe to and receive specific operational data streams from network devices in real-time.
YANG defines data models but does not directly reset devices; that is an operational action typically performed via management interfaces using configured models.
Setting informs and traps describes the functionality of SNMP (Simple Network Management Protocol), which is a different monitoring paradigm from model-driven telemetry.
YANG is a data modeling language used in model-driven telemetry to formally describe the configuration and operational state data on network devices. This allows clients to precisely specify and subscribe to particular data sets, which devices then stream continuously, rather than relying on periodic polling.
Model-driven telemetry is designed to move away from periodic polling, which is inefficient, towards continuous data streaming, making polling intervals irrelevant to its core function.
Concept tested: Model-Driven Telemetry and YANG
Source: https://www.cisco.com/c/en/us/td/docs/iosxr/cisco_iosxr_model_driven_telemetry_deployment_guide/cisco_iosxr_model_driven_telemetry_deployment_guide_chapter.html
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