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The connectivity categorization divides VPNs into simple VPNs (with any-to-any connectivity), overlay VPNs where a single site participates in more than one simple VPN, Central Services VPNs, where some sites have limited connectivity and Network Management VPNs, which are really only a special case of Central Services VPN. Review Questions Answer the following questions: 2-38 ■ What are the major Overlay VPN topologies ■ Why would the customers prefer partial mesh over full mesh topology? ■ What is the difference between an Intranet and an Extranet?

The Service Provider is responsible for transport of layer-2 frames between customer sites and the customer takes responsibility for all higher layers. 2-14 Advanced MPLS VPN Solutions Copyright  2000, Cisco Systems, Inc. Overlay VPN IP Tunneling Internet Protocol (IP) Generic Route Encapsulation (GRE) IP Security (IPSec) Internet Protocol (IP) VPN is implemented with IP-over-IP tunnels • Tunnels are established with GRE or IPSec • GRE is simpler (and quicker), IPSec provides authentication and security © 2000, Cisco Systems, Inc.

There are, however, a number of advanced VPN topologies with more complex connectivity requirements: 2-34 ■ Overlapping VPNs, where a site participates in more than one VPN ■ Central Services VPN, where the sites are split in two classes – server sites that can communicate with all other sites and client sites that can only communicate with the servers, but not with other clients. ■ Network Management VPN, which is used to manage CE devices in scenarios where the Service Provider owns and manages CE devices.

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