Section 4: Secure Connectivity with Cisco VPNs

In this section, we take a brief look at virtual private network (VPN) technologies, and then look at the types of VPNs implemented by Cisco IOS, focusing on the routing platform. This section also provides configuration steps for each of the covered VPN technologies.

VPN Overview

A VPN can be defined as a method to “securely transmit private data over a public infrastructure.” In practice, a VPN is effectively an encrypted tunnel over a public network such as the Internet. A tunnel is created between the two VPN endpoints. Data is encrypted before leaving the local VPN endpoint; and on arriving at the remote VPN endpoint, it is decrypted, ensuring data privacy and integrity.

Two main types of VPNs ...

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