Layer 2 VPN Operation
Question
Which statement is true about the operation of a Layer 2 VPN?
Answers
Explanations
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A. B. C. D.B
In a layer 2 VPN, the PE and CE do not exchange routing information, and therefore Layer 2 information is used to transport the traffic.
B. A Layer 2 VPN transports packets based on Data Link Layer headers.
Explanation:
A Layer 2 VPN is a type of Virtual Private Network that provides a transparent Ethernet bridge between two or more customer sites over an MPLS network. Layer 2 VPNs allow customers to extend their LANs over a service provider's network while maintaining control of their own IP addressing and routing.
Option A is incorrect because Layer 2 VPNs do not require the service provider to use a routing protocol from the PE to CE. Instead, Layer 2 VPNs rely on the MAC address of the devices connected to the VPN.
Option C is incorrect because Layer 2 VPNs transport all protocol information in their original form, including Layer 3 protocol information.
Option D is incorrect because VPN signaling is performed by the Border Gateway Protocol (BGP) or Label Distribution Protocol (LDP), not RSVP.
Therefore, the correct answer is B. A Layer 2 VPN transports packets based on Data Link Layer headers.
