tailieunhanh - IP Tunneling and VPNs

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 are explained along with Layer 2 and Layer 3 tunneling mechanisms. | IP Tunneling and VPNs 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 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 Explain Virtual Private Network concepts and possibilities Describe Layer-2 tunneling features Configure support for Microsoft Point-to-Point Tunneling Protocol PPTP and Encryption MPPE Configure L2TP Dial-in and Virtual Private Dial-up Network VPDN for dialin Describe and configure GRE Layer-3 tunneling Introduction to IP VPNs Objectives Upon completion of this module you will be able to perform the following tasks Define a Virtual Private Network VPN and its benefits Describe the various types of VPNs - Access intranet extranet - Layer 2 versus Layer 3 - Carrier-provided versus not 23-2 IP Tunneling and VPNs Copyright 2001 Cisco Systems Inc. Connectivity deployed on a shared infrastructure with the same policies and performance as a private network with lower total cost of ownership We will start by defining a VPN. An academic definition of a VPN is connectivity deployed on a shared infrastructure with the same policies and performance as a private network with lower total cost of ownership. The infrastructure is public and can be either the Internet an IP infrastructure a Frame Relay network or an Asynchronous Transfer Mode ATM WAN. Our focus today is on the big I the public Internet and IP VPNs to the exclusion of Frame Relay and ATM. Copyright 2001 Cisco Systems Inc. IP Tunneling and VPNs .