Virtual private networks (VPNs) provide secure data transmission across public networks by opening an encrypted connection between two hosts. VPNs use encryption, tunneling, and authentication to create a private network and securely transmit data. Some benefits of VPNs include enhanced data security, lower costs compared to maintaining private leased lines, and the ability to securely connect remote users and networks. Common VPN protocols are PPTP, L2TP combined with IPsec, with IPsec providing confidentiality, integrity, authentication, and protection against traffic analysis. VPNs are commonly used for remote user access and network tunneling.

1. Mobile and Wireless Data Security Group work: Naim Latifi Alvaro Pariente

3. Secure connection

4. VPN server-client

7. IPsec protocol

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