Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 45

Which statement about route distinguishers in an MPLS network is true?

Answer options

• A. Route distinguishers allow multiple instances of a routing table to coexist within the edge router.
• B. Route distinguishers are used for label bindings.
• C. Route distinguishers make a unique VPNv4 address across the MPLS network.
• D. Route distinguishers define which prefixes are imported and exported on the edge router.

Correct answer: C

Explanation

The correct answer is C because route distinguishers are specifically used to ensure that VPNv4 addresses are unique across the MPLS network, allowing for overlapping IP addresses in different VPNs. Options A and D are incorrect as they misinterpret the role of route distinguishers, and option B is also wrong since route distinguishers do not directly deal with label bindings.