A network architect must implement CSC VPN services for a new backbone carrier.

 Implementing CSC VPN services for a new backbone carrier provides several benefits. Firstly, it maintains a single backbone network, which simplifies the VPN implementation to customers (A). This eliminates the need for each Level 2 carrier to create and maintain a separate backbone network, thus lowering maintenance costs and simplifying management operations. Secondly, it supports a scalable growth strategy that services multiple customers efficiently (D). The Level 1 carrier can use one backbone network to provide VPN and Internet services for multiple Level 2 carriers, increasing revenues and efficiency.

References: The benefits of implementing CSC VPN services are detailed in the Huawei IP Encyclopedia, which explains the Carrier’s Carrier (CSC) networking solution in BGP/MPLS IP VPN2.