With cost-effective, high-bandwidth Internet connectivity that is
secured by encrypted VPN tunnels, you can reduce WAN bandwidth costs while increasing
connectivity speeds.
By integrating advanced network intelligence and routing, Cisco VPNs reliably transport
complex mission-critical traf?¬?c, such as voice and client-server applications, without
compromising communications quality or security.
VPNs and Their Benefits
A VPN is an encrypted connection between private networks over a public network such as
the Internet. The V stands for virtual, and the N stands for network. The information from
a private network is securely transported over a public network, the Internet, to form a
virtual network. The P stands for private. To remain private, the traf?¬?c is encrypted to keep
the data con?¬?dential. Instead of using a dedicated Layer 2 connection such as a leased line,
a VPN uses IPsec to form virtual connections that are routed through the Internet from the
private network of the company to the remote site or employee host. Figure 8-1 shows some
examples of using VPNs to connect different types of remote sites.
Figure 8-1 VPN Connectivity
Legacy
Concentrator
Legacy
PIX
Firewall
ASA
Business Partner
with a Cisco Router
Mobile Worker with a
Cisco VPN Client
on a Laptop Computer
Corporate
Main Site
Perimeter
Router
POP
Regional Office with
a PIX Firewall
SOHO with a Cisco
ISDN/DSL Router
IPsec
Introducing VPN Solutions 299
Bene?¬?ts of VPNs include the following:
?– Cost savings: VPNs enable organizations to use cost-effective third-party Internet
transport to connect remote of?¬?ces and remote users to the main corporate site, thus
eliminating expensive dedicated WAN links and modem banks.
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