You have been asked to provision a service provider's network to accommodate Layer 3 VPNs as defined in RPC 4364. Which three tasks must be performed before the provider core is ready to carry VPN traffic? (Choose three.)
Click on the arrows to vote for the correct answer
A. B. C. D. E.BCE
Layer 3 VPNs, as defined in RFC 4364, are a type of Virtual Private Network ( VPN) that use Layer 3 routing protocols, such as Border Gateway Protocol (BGP), to provide secure, private connectivity between different customer sites across a service provider network. To provision a service provider network to support Layer 3 VPNs, there are several tasks that must be performed before the provider core is ready to carry VPN traffic. The three most important tasks are:
A. All P routers and PE routers must be configured to support MPLS administrative-groups (colors)
MPLS administrative groups, also known as "colors," are used to create multiple independent VPNs on a single physical network. This is important because it allows each customer to have their own private network without interfering with other customers' traffic. To support Layer 3 VPNs, all Provider Edge (PE) routers and Provider (P) routers must be configured to support MPLS administrative groups. This ensures that traffic is correctly routed between VPNs and prevents traffic from leaking between different VPNs.
B. All PE routers must be configured to support Multiprotocol BGP (MP-BGP)
Multiprotocol BGP (MP-BGP) is a variant of BGP that supports the exchange of routing information for multiple network layer protocols, including IPv4 and IPv6. MP-BGP is used to distribute VPN routing information between PE routers in a Layer 3 VPN environment. Without MP-BGP, the PE routers would not be able to exchange routing information about the VPNs, and the VPN traffic would not be properly routed.
C. All P routers and PE routers must have a signaling protocol such as RSVP or LDP enabled
To set up and manage MPLS-based VPNs, a signaling protocol must be used to establish the MPLS label-switched paths (LSPs) that are used to forward traffic between routers. The two most common signaling protocols used in MPLS networks are Resource Reservation Protocol (RSVP) and Label Distribution Protocol (LDP). Both protocols can be used to establish LSPs and allocate MPLS labels to network traffic. Therefore, all P routers and PE routers in the provider network must have either RSVP or LDP enabled to set up the MPLS LSPs used to forward VPN traffic.
In conclusion, to provision a service provider's network to accommodate Layer 3 VPNs as defined in RFC 4364, the three essential tasks that must be performed before the provider core is ready to carry VPN traffic are: A. Configuring all P routers and PE routers to support MPLS administrative-groups (colors) B. Configuring all PE routers to support Multiprotocol BGP (MP-BGP) C. Enabling a signaling protocol such as RSVP or LDP on all P routers and PE routers