Which statement about route distinguishers in an MPLS network is true?
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Correct answer: Route distinguishers make a unique VPNv4 address across the MPLS network..
Why this is the answer
Route distinguishers (RDs) are 8-byte values prepended to IPv4 prefixes to create unique VPNv4 addresses. This allows identical IPv4 prefixes from different VPNs to be distinguished within the MPLS backbone. Without RDs, if two different VPNs used the same IP subnet (e.g., 10.0.0.0/24), the MPLS network would not be able to differentiate between them. RDs ensure that each VPN's routes are unique globally within the MPLS domain. The other options are incorrect because: RDs do not directly allow multiple routing table instances to coexist; VRFs (Virtual Routing and Forwarding instances) handle that. RDs are used within VRFs to ensure prefix uniqueness. RDs are not used for label bindings; MPLS labels are assigned to prefixes for forwarding. Route targets (RTs), not RDs, define which prefixes are imported and exported between VRFs.
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