Which routing instance type is used to facilitate filter-based forwarding?
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A. B. C. D.C
The correct answer to the question is B. FBF, which stands for Filter-Based Forwarding.
FBF is a Junos feature that enables traffic to be forwarded based on specific criteria, such as the source address, destination address, or application protocol. It allows traffic to be selectively forwarded to a specific next-hop or egress interface based on predefined filters.
To implement FBF, you need to define a routing instance of type forwarding. This type of routing instance does not maintain its own routing table but uses the routing table of another routing instance, known as the master routing instance.
When FBF is configured on a device, the device looks up the routing table in the master routing instance to determine the next-hop or egress interface for a packet. The device then applies the filters defined in the forwarding routing instance to determine if the packet should be forwarded or dropped.
For example, if you want to forward traffic from a specific source address to a specific next-hop address, you can define a filter that matches on the source address and applies the next-hop address as the forwarding target.
In summary, FBF is a powerful tool for selectively forwarding traffic based on predefined filters. To implement FBF, you need to define a routing instance of type forwarding that uses the routing table of another routing instance as the master routing instance.