A Tier-3 Service Provider is evolving into a Tier-2 Service Provider due to the amount of
Enterprise business it is receiving. The network engineers are re-evaluating their IP/MPLS
design considerations in order to support duplicate/overlapping IP addressing from their
Enterprise customers within each Layer 3 VPN. Which of the following would need to be
reviewed to ensure stability in their network?

A.
Assigning unique Route Target ID’s

B.
Assigning unique Route Distinguishers

C.
Assigning unique IP address space for the Enterprise NAT/Firewalls

D.
Assigning unique VRF ID’s to each Layer 3 VPN