Tunneling and VPN

Abstract

Overview The purpose of this module is to explain Virtual Private Network (VPN) concepts and to overview various L2 and L3 tunneling techniques that allow for implementation of VPNs. The access VPN features in Cisco IOS Release 12.1 are explained along with Layer 2 and Layer 3 tunneling mechanisms. Objectives Upon completion of this module, you will be able to perform the following tasks: n Explain Virtual Private Network concepts and possibilities n Describe Layer-2 tunneling features n Configure support for Microsoft Point-to-Point Tunneling Protocol (PPTP) and Encryption (MPPE) n Configure L2TP Dial-in and Virtual Private Dial-up Network (VPDN) for dial-in n Describe and configure GRE Layer-3 tunneling 23-2 IP Tunneling and VPNs