A complete guide to understanding, designing, and use Layer 2 VPN technologies and pseudowire emulation applications Evaluate market drivers for Layer 2 VPNs Understand the architectural framework and options for Layer 2 VPNs, including AToM and L2TPv3 Grasp the essence of Layer 2 LAN and WAN technologies Check the theoretical and operational details of MPLS and LDP as they relate to AToM Understanding the theoretical and operational details of Layer 2 protocols over L2TPv3 in IP networks Learn about Layer 2 VPN bridge and directed interworking and Layer 2 local switching operations and applications Understanding Virtual Private LAN Services (VPLS) Learn about the foundation and advanced AToM and L2TPv3 topics through a collection of case studies The history of disconnect between legacy Layer 2 and Layer 3 VPN solutions has forced service providers to build, operate, and maintain separate infrastructures to accommodate various VPN access technologies. By bringing together several layers of carrier networks and provide a range of integrated services and software management tools over this infrastructure, Cisco's Layer 2 VPN solution enables established, IP-oriented ISP / CLECs, and large enterprise customers (LECs) to reach a broader set of potential VPN customers and offer truly global VPNs. Layer 2 VPN Architectures is a comprehensive guide consolidation of network infrastructure and extending VPN services. The case studies include all Layer 2 technologies pseudowires transported using AToM and L2TPv3, including Ethernet, Ethernet VLAN, HDLC, PPP, Frame Relay, ATM AAL5 and ATM cells, and advanced topics relevant to Layer 2 VPN deployment, such as QoS and scalability .