The basics; setting the stage; VPN phenomenon; basic data communications; protocol overview; managing network devices; encapsulation; point-to-point protocol; foundations of PPP; negotiating, maintaining and terminating a PPP connection; options and extensions to PPP; configuring PPP; managing PPP; tunnelling protocols; IP in X.25.; PPP in X.25.; point-to-point tunnelling protocol; layer 2 forwarding; layer 2 tunnelling protocol; securing the connection; IPSec; Internet protocol security; implementing the new Internet; where to go from here.