正解:B
An advantage of streaming telemetry over SNMP is that it supports periodic push-based subscription messages. Streaming telemetry is a method of collecting and transporting network data from devices to a receiver, such as a collector or a dashboard. Streaming telemetry allows the devices to send data periodically or on-demand, based on a subscription model. The receiver can subscribe to specific data sets or events that it is interested in, and the device will push the data to the receiver as it becomes available. This reduces the overhead and latency of polling the device status using SNMP, and provides more granular and real-time visibility into the network state and performance. References :=
* Implementing and Operating Cisco Data Center Core Technologies (DCCOR) v1.2, Module 8: Data Center Automation and Orchestration, Lesson 8.2: Cisco NX-OS Programmability
* Cisco Nexus 9000 Series NX-OS Programmability Guide, Release 9.3(x), Chapter: Configuring Streaming Telemetry