TCP / IP (9)
Security: TCP/IP by itself offers no security
- PGP - Pretty Good Privacy
- S/MIME - Secure MIME
- IPSEC - Internet Protocol Security
Tunneling Technology
- Layer2 forwarding : PPP packet is tunneled across the network
- PPTP - Microsoft (In Win NT)
- L2F - Cisco (Layer 2 forwarding)
- ATMP - Ascend (Ascend Tunnel Management Protocol)
- L2TP - Microsoft / Cisco (Layer 2 Tunneling Protocol)
- Layer3 forwarding
- PPP session is terminated at the remote access server and only the layer3 payload is tunneled
- Mobile IP - IETF (for cellular networks)