What are two functions of the RE? (Choose two).
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A. B. C. D.AC
The Routing Engine (RE) is a control plane component in a Juniper Networks router. It provides control and management functions for the router, including the following:
Maintaining Routing Tables: The RE maintains the routing tables used by the router to determine the best path for forwarding packets. The routing tables are stored in memory and updated dynamically as changes occur in the network topology.
Managing the Packet Forwarding Engine (PFE): The PFE is responsible for forwarding packets through the router's interfaces. The RE communicates with the PFE to manage the forwarding process, including the installation of forwarding tables and the configuration of packet filters.
Option C, "to manage the PFE", is incorrect because it is not a function of the RE, but rather a component of the router architecture that is managed by the RE.
Option B, "to forward traffic toward its destination", is incorrect because packet forwarding is the responsibility of the PFE, not the RE. The RE provides control and management functions, but it does not participate in the forwarding of packets.
Option D, "to implement various services such as policing, stateless firewall filtering, and class of service", is partially correct. The RE is responsible for configuring and managing these services, but it does not implement them directly. Instead, the configuration is passed to the PFE, which implements the services at the forwarding stage.
In summary, the two functions of the RE are to maintain routing tables and to manage the PFE.