Vpn Overview; Chapter 1 Vpn Overview; Features Of Vpn; Benefits Of Vpn - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide

1.1 VPN Overview

Along with the increasingly wide application of the Internet, Virtual Private Network
(VPN) emerged to construct private networks on public networks. "Virtual" here mainly
indicates that VPN is a kind of logical networks.
Employees travel around on business more and more frequently; foreign services and
customers are scattered more widely; cooperation is conducted with a growing number
of partners - all these are sound quite familiar to all the growing companies. More and
more companies therefore turn to the Internet for market promotion, sales, aftersales
services, and also for conducting training, cooperation and other counseling activities.
This provides a broad market for the application of VPN.

1.1.1 Features of VPN

Different from a traditional network, VPN does not exist physically. It is a kind of
logical network, a virtual network formed through resources collocation employing
the current public network.
Each VPN is only for a particular enterprise or group of users. For VPN users, VPN
is just like any traditional private network. As a kind of private network, VPN keeps
resources independent of the underlying network, meaning resources of each
VPN are normally inaccessible for other VPNs over the underlying network and
users outside this VPN. It also delivers adequate security, safeguarding the
internal information of VPN against external invasion.
VPN is a kind of upper layer service but not simple. It establishes network
interconnection between private network users, including network topology inside
VPN, route calculation, joining and leaving of members, etc. Thus, VPN
technology is much more complicated, compared to common point-to-point
applications alike.

1.1.2 Benefits of VPN

VPN allows you to:
Establish reliable and safe connection between remote users, oversea agencies,
partners, suppliers and company headquarters, ensuring security of data
transmission. This advantage is of special significance to the amalgamation of
E-business or financial network with communication network.
Provide information communication over public networks, thus allowing
enterprises to connect with remote offices, staff traveling on business and

Chapter 1 VPN Overview

3Com Corporation
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Chapter 1 VPN Overview