JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 54

Which two statements are true about MPLS VPNs? (Choose two.)

Answer options

• A. With Layer 3 VPNs, the provider’s routers participate in the customer’s Layer 3 routing.
• B. MPLS VPNs are designed to run over private networks rather than the public Internet.
• C. With Layer 2 VPNs, the provider does not participate in the routing of the customer’s private IP traffic.
• D. MPLS VPN tunnels are always encrypted.

Correct answer: A, C

Explanation

The correct answers are A and C. In Layer 3 VPNs, the service provider's routers indeed take part in the customer's routing, while in Layer 2 VPNs, the provider does not engage in routing the customer's private traffic. Option B is incorrect because MPLS VPNs can also operate over the public Internet, and option D is false as not all MPLS VPN tunnels are encrypted.