Which feature of the Junos OS installs routes in multiple routing tables?

The correct answer is associated with RIB groups, which function in the Junos OS to facilitate the installation of routes into multiple routing tables. RIB stands for Routing Information Base, and RIB groups allow for the aggregation of several routing tables, enabling the sharing of routing information between them. This is particularly useful in various network scenarios, such as multi-tenancy or maintaining distinct routing policies for different network segments.

By using RIB groups, a single routing protocol can insert routes into multiple RIBs, enhancing flexibility in route management, policy application, and maintaining operational divisions within the network. This feature is integral for complex network architectures where different routing processes need to operate simultaneously without interfering with each other.

In contrast, virtual routers serve as isolated instances of the routing functions in Junos OS, operating independently and with separate routing tables for different logical routers, which doesn't inherently create links between different tables. Forwarding table policies are primarily used for controlling how packets are forwarded based on specific criteria but do not directly deal with the installation of routes into multiple tables. Routing table policies manage how routes are selected and applied but do not inherently facilitate the installation of routes into multiple tables as RIB groups do.