Exam JN0-104 topic 1 question 89 discussion

A. The Routing Engine (RE) on Junos OS devices maintains the routing tables. The routing tables store information about routes learned from various sources, including their preferences and metrics. The RE is responsible for running routing protocols, processing routing updates, and updating the routing tables accordingly. D. The RE is considered the control plane because it handles the management and control functions of the device, such as running routing protocols, maintaining routing tables, and managing the device's configuration. The control plane is separate from the data plane, which is responsible for forwarding traffic.

Ref: Juniper Networks Partner Solution Development Platform: Architecture of the JUNOS System “Architecture of the JUNOS System … The Routing Engine operates all routing protocols and makes all routing decisions by creating a routing table that includes the best path to each destination. The router writes these paths to a forwarding table in the Routing Engine and then copies the same data to the forwarding table on the Packet Forwarding Engine (PFE) which actually forwards the packets. … The Control Plane … The control plane runs on the Routing Engine. Its role is to manage and control the behavior of the device, including the data plane and the services plane. …” Answer: AD