There are different technologies available for Wide Area Network (WAN) connectivity. But the main drawback of many Wide Area Network (WAN) connectivity solutions is "Cost". Think about an organization which has 100 offices all over the world. Providing Wide Area Network (WAN) connectivity using Leased Lines, for all these offices will be too costly. A Virtual Private Network (VPN) is a Network Security Technology, which is used to secure private network traffic over a public network such as the Internet. A VPN ensures Data Confidentiality (privacy) and Data Integrity for network data in its journey from the source device to destination device using network security protocols like IPSec (Internet Protocol Security). IPSec (Internet Protocol Security) VPN provide Data Confidentiality by encrypting the data at the sending device and decrypting the data at receiving end. CISCO VPN.the Cisco AnyConnect Virtual Private Networking (VPN) system, which allows authenticated access to University of Illinois computing resources from any location.1.To use a VPN, each client must possess the appropriate networking software or hardware support on their local network and computers. When set up properly, VPN solutions are easy to use.2.Despite their popularity, VPNs are not perfect and limitations exist as is true for any technology. Organizations should consider issues like the below when deploying and using virtual private networks in their operations.3.The reliability and performance of an Internet-based VPN is not under an organization's direct control. Instead, the solution relies on an ISP and their quality of service.3.I wish. The client, king of technology buzzwords, specifically asked for an "IPSEC SSL VPN using the Cisco VPN client". Of course, when asked how he wants to implement IPSEC, he doesn't know what we're talking about.
A Cisco ASA will act as the VPN server
I want to make sure I understand the NAT-T configuration with Cisco before I suggest using L2TP
