COMPUTER NETWORKING

Detailed explanation-1: -Layer 2 VPNs are a type of Virtual Private Network (VPN) that uses MPLS labels to transport data. The communication occurs between routers that are known as Provider Edge routers (PEs), as they sit on the edge of the provider’s network, next to the customer’s network.

Detailed explanation-2: -A Layer 2 Virtual Private Network (VPN) emulates a physical sub-network in an IP or MPLS network, by creating private connections between two points. Building a L2VPN network requires coordination between the service provider and customer. The service provider establishes Layer 2 connectivity.

Detailed explanation-3: -L2TP uses Public-Key Infrastructure in the form of digital certificates. PPTP uses 128-bit encryption. L2TP uses 256-bit encryption. PPTP has performance issues on unstable networks.