Which Layer 3 VPN attribute allows different customers to connect to the same MPLS network...

In a Layer 3 VPN (Virtual Private Network) over an MPLS (Multiprotocol Label Switching) network, the attribute that allows different customers to connect with overlapping IP ranges is the Route Distinguisher (RD)123.

RD is a unique identifier that is prepended to each IP address in a customer’s VPN to create a unique VPNv4 address. This allows customers to use overlapping IP addresses without conflict123. The RD makes it possible for the same IP prefix to exist in different VPNs, which is crucial when customers have overlapping IP ranges123.