MPLS Design Attributes for Dedicated VPN Internet Access

D.

The correct answer is A. The Internet gateway router is connected as a PE router to the MPLS backbone.

MPLS (Multiprotocol Label Switching) is a technology that allows the creation of virtual private networks ( VPNs) over a service provider's core network. It provides a way to transport traffic between different sites of an organization securely and with quality of service (QoS) guarantees.

In the context of the question, the objective is to provide Internet access to a major customer through a separate dedicated VPN. This means that the customer should be able to access the Internet while keeping their traffic isolated from other customers' traffic.

Option A suggests that the Internet gateway router should be connected as a PE (Provider Edge) router to the MPLS backbone. A PE router is a router located at the edge of the service provider's network that connects to the customer's network. By connecting the Internet gateway router as a PE router, it becomes part of the VPN, and traffic can be exchanged between the customer's network and the Internet. The Internet traffic from the customer's network can be sent to the Internet gateway router, which can then be forwarded to the Internet.

Option B suggests that the CE (Customer Edge) router should support VRF-Lite and the full BGP routing table. VRF (Virtual Routing and Forwarding) Lite is a feature that allows the creation of multiple virtual routing tables on a CE router, which can be used to isolate traffic between different VPNs. However, this option does not address the requirement of providing Internet access to the customer.

Option C suggests that the Internet gateway should insert the full Internet BGP routing table into the Internet access VPN. BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different networks. However, this option does not provide a way to isolate the customer's traffic from other customers' traffic.

Option D suggests that the customer that needs the Internet access service is assigned to the same RTs (Route Targets) as the Internet gateway. RTs are used in MPLS VPNs to identify which VPN a packet belongs to. However, this option does not provide a way to provide Internet access to the customer while keeping their traffic isolated from other customers' traffic.

Therefore, the correct answer is A. The Internet gateway router is connected as a PE router to the MPLS backbone.