Which command will show the best paths that are installed in the PFE?

D

The correct answer is D. "show route forwarding-table".

Explanation:

In Junos, the routing table is maintained in the Routing Engine (RE) and the forwarding table is maintained in the Packet Forwarding Engine (PFE). The forwarding table is used by the PFE to forward packets at high speeds.

The "show route" command displays the contents of the routing table in the RE, including all the paths that have been learned by the routing protocol. However, it does not show the best paths that are installed in the PFE.

The "show route active-path" command displays the active path selected by the routing protocol for a particular destination prefix. However, it does not show all the best paths that are installed in the PFE.

The "show route private" command displays routes that have been marked as private by the routing protocol, such as static routes, aggregate routes, and generated routes. It does not show the best paths that are installed in the PFE.

The "show route forwarding-table" command displays the contents of the forwarding table in the PFE, which includes the best paths selected by the routing protocol. This command provides the most accurate and up-to-date information on the paths that are being used by the PFE to forward packets.

Therefore, the correct command to show the best paths that are installed in the PFE is "show route forwarding-table".