Which statement is true about the operation of a Layer 3 VPN as defined in RFC 4364?
Click on the arrows to vote for the correct answer
A. B. C. D.C
The Layer 3 Virtual Private Network ( VPN) is a type of VPN service that provides connectivity between geographically dispersed sites over the internet. It allows companies to connect remote sites or branch offices together in a secure and efficient manner. The Layer 3 VPN is defined in RFC 4364, which outlines the architecture and operational requirements of this type of VPN.
Regarding the statement mentioned in the question, it is true that in a Layer 3 VPN as defined in RFC 4364:
C. BGP is used for routing and MPLS is used for forwarding
The Layer 3 VPN uses MPLS (Multiprotocol Label Switching) to provide forwarding and BGP (Border Gateway Protocol) to provide routing. This combination of MPLS and BGP is commonly referred to as BGP/MPLS VPN.
BGP is responsible for exchanging VPN routing information between the Provider Edge (PE) routers in the service provider network and the Customer Edge (CE) routers in the customer network. BGP is used to distribute VPNv4 ( VPN version 4) routes between the PE routers.
On the other hand, MPLS is used for forwarding the VPN traffic across the provider network. MPLS labels are assigned to the VPN traffic by the PE routers and are used to forward the traffic across the provider network to the destination PE router, which then removes the label and forwards the traffic to the destination CE router.
LDP (Label Distribution Protocol) and RSVP (Resource Reservation Protocol) are both MPLS-based protocols, but they are not used for Layer 3 VPNs as defined in RFC 4364.
Therefore, option C is the correct answer.