You are provisioning a new customer for access to your Layer 3 VPN. The customer is using
172.16.35.0/24 as their internal IP address space, which is also being used by an existing Layer 3
VPN customer. The two customers share many PE routers in common across your network.
Which mechanism allows these duplicate addresses to exist in your network?
A.
route origin
B.
route target
C.
route refresh
D.
route distinguisher
Explanation:
https://www.juniper.net/techpubs/en_US/junos14.1/topics/concept/vpn-ipv4-addresses-and-route-distinguishers.html
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To avoid overlapping private addresses, you can configure the network devices to use public addresses instead of private addresses. However, this is a large and complex undertaking. The solution provided in RFC 4364 uses the existing private network numbers to create a new address that is unambiguous. The new address is part of the VPN-IPv4 address family, which is a BGP address family added as an extension to the BGP protocol. In VPN-IPv4 addresses, a value that identifies the VPN, called a route distinguisher,
is prefixed to the private IPv4 address, providing an address that uniquely identifies a private IPv4 address
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