300-420 Question 157
Single answerA service provider is designing a Layer 2 VPN solution to connect two remote customer sites over its MPLS network. The customer requires their VLANs to be preserved across the MPLS network while also allowing for the possibility of multiple VLANs being transported without significant reconfiguration. Which Layer 2 VPN technology is the most appropriate to meet these requirements?
- A
Ethernet over MPLS (EoMPLS)
- B
Virtual Private LAN Service (VPLS)
- C
Point-to-Point GRE Tunnels
- D
Layer 3 MPLS VPN
Show answer and explanation
Correct answer: A
Explanation
Ethernet over MPLS (EoMPLS) is the most appropriate technology for this scenario because it provides Layer 2 connectivity between two remote sites while preserving VLAN information. It is specifically designed for point-to-point Layer 2 VPN use cases over MPLS networks, fulfilling the customer's requirement of transporting multiple VLANs without significant reconfiguration.
- A. Correct.
Ethernet over MPLS (EoMPLS) is a Layer 2 VPN technology that supports the transport of Ethernet frames over an MPLS network while preserving VLAN tags. It is well-suited for point-to-point connectivity between sites.
- B. Incorrect.
Virtual Private LAN Service (VPLS) extends Layer 2 connectivity over an MPLS network but is primarily used for multi-point-to-multi-point connectivity, which is not required in this scenario.
- C. Incorrect.
Point-to-Point GRE Tunnels are Layer 3 solutions that encapsulate Layer 3 traffic over IP networks and do not inherently preserve Layer 2 characteristics such as VLANs.
- D. Incorrect.
Layer 3 MPLS VPN is a Layer 3 solution that routes IP traffic between customer sites, making it unsuitable for scenarios requiring Layer 2 connectivity and VLAN preservation.