Which of the following statements is TRUE concerning route distinguishes on the 7750 SR?

All the provided statements about Route Distinguishers (RDs) are false. An RD is an 8-byte (64-bit) value, not 12 bytes. It is prepended to a 4-byte IPv4 prefix to create a 12-byte (96-bit) unique VPN-IPv4 prefix, not a 16-byte one. The function of an RD is solely to make customer prefixes unique within the provider's BGP infrastructure, allowing for overlapping IP address spaces. Route Targets (RTs), not RDs, are used to control the import and export of routes into a VPRN's routing table (VRF). Finally, RDs are configured on the provider edge (PE) router, not the customer edge (CE) device.

A. A Route Distinguisher is an 8-byte (64-bit) value, as defined in RFC 4364.
B. An 8-byte RD is prepended to a 4-byte IPv4 prefix, creating a 12-byte (96-bit) VPN-IPv4 prefix.
C. Route Targets (RTs) are BGP extended communities used to control the import/export of routes for a VPRN, not Route Distinguishers.
D. The Route Distinguisher is configured on the PE router as part of the VPRN service configuration, not on the CE router.
E. Since statements A, B, C, and D are all false, this option is incorrect.

1. RFC 4364, "BGP/MPLS IP Virtual Private Networks (VPNs)", Section 4.2, "The VPN-IPv4 Address Family", Page 6. (States a VPN-IPv4 address is 12 octets: 8-octet RD and 4-octet IPv4 address).

2. Nokia 7750 SR OS Services Architecture Guide, Release 21.10.R1, "VPRN Services Overview". (Describes the function of RDs to create unique prefixes and RTs for VPN membership).

3. Nokia 4A0-104 Courseware, "Nokia Multiprotocol Label Switching", Module 3: MPLS-based Layer 3 VPNs. (Explains the distinction between the roles of Route Distinguishers and Route Targets).