Forwarding Traffic Using DLCI 600: Maintaining Layer 2 Information Across VPN

B

The customer's requirement is to forward traffic using DLCI 600 while maintaining Layer 2 information across a VPN. This means that the customer needs a VPN solution that can support Layer 2 connectivity across the network.

A. A Layer 3 VPN is a type of VPN that provides connectivity between two or more networks using IP addressing. Layer 3 VPNs operate at the network layer and use routing protocols to forward traffic between sites. However, Layer 3 VPNs do not maintain Layer 2 information across the network. Therefore, a Layer 3 VPN does not meet the customer's requirements.

B. A Layer 2 VPN is a type of VPN that provides connectivity between two or more networks at the data link layer. Layer 2 VPNs maintain Layer 2 information across the network, including MAC addresses and VLAN tags. Therefore, a Layer 2 VPN meets the customer's requirements.

C. Virtual Private LAN Service (VPLS) is a Layer 2 VPN technology that allows multiple sites to connect to a single Ethernet broadcast domain. VPLS uses MPLS to transport Ethernet frames between sites, and it maintains Layer 2 information across the network. Therefore, VPLS meets the customer's requirements.

D. An IPsec VPN is a type of VPN that provides secure connectivity between two or more networks using IPsec encryption. However, IPsec VPNs do not maintain Layer 2 information across the network. Therefore, an IPsec VPN does not meet the customer's requirements.

In conclusion, the solutions that meet the customer's requirement of forwarding traffic using DLCI 600 and maintaining Layer 2 information across a VPN are a Layer 2 VPN and Virtual Private LAN Service (VPLS).