300-420 Question 191
Single answerAn enterprise is deploying a Layer 2 VPN to connect two remote branch offices over a service provider MPLS network. The solution must provide Ethernet-like connectivity between the sites while maintaining VLAN transparency for the customer. Which technology would be the most appropriate to meet this requirement?
- A
EoMPLS (Ethernet over MPLS)
- B
VPLS (Virtual Private LAN Service)
- C
DMVPN (Dynamic Multipoint VPN)
- D
IPsec VPN
Show answer and explanation
Correct answer: A
Explanation
The enterprise requires a Layer 2 VPN solution that provides Ethernet-like point-to-point connectivity between branch offices while preserving VLAN transparency. EoMPLS is designed precisely for such scenarios, as it allows Ethernet frames to traverse the MPLS backbone without modification, meeting the stated requirements. Other options either operate at Layer 3 or are intended for different use cases, such as multipoint connectivity.
- A. Correct.
EoMPLS (Ethernet over MPLS) is the correct choice because it provides point-to-point Layer 2 Ethernet services over an MPLS network, maintaining VLAN transparency and Layer 2 connectivity.
- B. Incorrect.
VPLS (Virtual Private LAN Service) is incorrect because it is used for multipoint-to-multipoint Layer 2 VPNs, and the requirement in the scenario is for point-to-point Layer 2 connectivity.
- C. Incorrect.
DMVPN (Dynamic Multipoint VPN) is incorrect because it provides IP-based Layer 3 VPN connectivity, not Layer 2 VPN services.
- D. Incorrect.
IPsec VPN is incorrect because it operates at Layer 3 and does not support Layer 2 or VLAN transparency.