VPN Encapsulation of Packets

ATM

IP

L2TP

PPP

IP

TCP

Internet

VPN Tunnel

VPN

Device

Telephone

Line

ISP

Employee’s

Home

Access

Server

SMTP

Packet in transmission through the Internet

PPP

IP

TCP

SMTP

PPP

IP

TCP

SMTP

Backbone

Packet from the client computer

Packet from the VPN

Outgoing packets from the VPN are sent through specially designed routers or switches.

VPN

Device

Access

Server

L2TP: Layer 2 Tunneling Protocol

(An emerging VPN Layer-2 access protocol)

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