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Chapter 2 Deploying Cisco Secure ACS
Basic Deployment Factors for Cisco Secure ACS
2-12
Cisco Secure ACS 3.0 for Windows 2000/NT Servers User Guide
78-13751-01, Version 3.0
• Security—VPNs provide the highest level of security using advanced
encryption and authentication protocols that protect data from unauthorized
access.
• Scalability—VPNs allow corporations to use remote access infrastructure
within ISPs. Therefore, corporations can add a virtually unlimited amount of
capacity without adding significant infrastructure.
• Compatibility with Broadband Technology—VPNs allow mobile workers,
telecommuters, and day extenders to take advantage of high-speed,
broadband connectivity, such as DSL and cable, when gaining access to their
corporate networks, providing workers significant flexibility and efficiency.
Figure 2-7 Simple VPN Configuration
There are two types of VPN access into a network, as follows:
• Site-to-Site VPNs—Extend the classic WAN by providing large-scale
encryption between multiple fixed sites such as remote offices and central
offices, over a public network, such as the Internet.
• Remote Access VPNs—Permit secure, encrypted connections between
mobile or remote users and their corporate networks via a third-party
network, such as a service provider, via VPN client software.
Generally speaking, site-to-site VPNs can be viewed as a typical WAN connection
and are not usually configured to use AAA to secure the initial connection and are
likely to use the device-oriented IPSec tunneling protocol. Remote Access VPNs,
however, are similar to classic remote connection technology (modem/ISDN) and
lend themselves to using the AAA model very effectively; see Figure 2-8 on
page 2-13.
VPN concentrator
Cisco Secure
Access Control Server
Network WAN
Tunnel
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