What is the function of the RT in MPLS VPNs?
- The RT is used to transform the nonunique IP addresses of the customer into unique VPNv4 addresses.
- The RT attaches a set of VPN identifiers to a route that indicate its membership in several VPNs.
- The RT attaches a set of VPN identifiers to a route that indicate its membership in single VPN.
- The RT attaches a single VPN identifier to a route that indicates its membership in several VPNs.
Explanation: Route Targets (RTs) are extended BGP community attributes used to identify VPN membership. Unlike Route Distinguishers (RDs), which make a prefix unique, RTs define which VRF tables a route should be imported into or exported from. This mechanism supports complex topologies where a site can be a member of multiple VPNs simultaneously.
Related exam: Checkpoint Exam: MPLS and VPN Technologies
