Nokia Certified Network Associate (NCNA) — Question 24

How does a VPRN service avoid the problem of overlapping IP addresses from different customers?

Answer options

• A. You cannot have overlapping IP addresses. Customers must change their IP address assignment.
• B. Each VPRN service maintains a separate VPN routing and forwarding instance to separate customer routing information. This allows for overlapping addresses.
• C. A VPRN ignores IP addressing information and uses MAC addressing instead, which are always unique.
• D. A VPRN translates customer IP addresses to a private addressing scheme administered by the service provider.

Correct answer: B

Explanation

The correct answer is B, as each VPRN service operates its own VPN routing and forwarding instance, which allows for the separation of customer routing information, enabling overlapping IP addresses. Option A is incorrect because it does not allow for overlapping addresses, which VPRN services can handle. Option C is wrong because VPRN uses IP addressing, not MAC addressing, and option D misrepresents how VPRN services manage IP addresses; they do not translate them into a private scheme.