Which characteristic fits a hub-and-spoke PE deployment in a Layer 3 MPLS VPN?
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Correct answer: The PE routers use different RTs to import and export M-BGP prefixes..
Why this is the answer
In a hub-and-spoke MPLS VPN, the hub PE needs to import routes from all spokes, and spokes need to import routes only from the hub. This is achieved by using different Route Targets (RTs). The hub PE will have a VRF configured to export a specific RT (e.g., 100:1) and import another (e.g., 100:2). Each spoke PE will have its VRF configured to export the RT imported by the hub (100:2) and import the RT exported by the hub (100:1). Route Distinguishers (RDs) are used to make routes unique within the BGP routing table, not for controlling route import/export between VRFs. While PEs will have multiple VRFs, this option doesn't explain the hub-and-spoke traffic flow control.
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