The Enterprise Campus
CORE
BUILDING B
Campus Backbone A Campus Backbone B
BUILDING A BUILDING C
Building
Distribution A
Building
Distribution B
Building
Distribution A
Building
Distribution B
Building
Distribution A Building
Distribution B
2nd Floor Access
4th Floor Access
2nd Floor Access
4th Floor Access
2nd Floor Access
4th Floor Access
1st Floor Access 3rd Floor Access 1st Floor Access 3rd Floor Access 1st Floor Access 3rd Floor Access
Remote Access
WAN
Campus Backbone
Edge
Distribution
Internal Router
DMZ Firewall
Web
Database IDC
App Server
Internet Router
Corporate
Router
Dial-In
Internal Router
DMZ Firewall
Public
Servers
Internet
Router
Internal Router VPN
IDS
PPP
Enterprise Edge Service Provider Edge
Internet
PSTN
Frame Relay ATM
Internal Firewall
Internal Firewall
Caching
Firewall
E-Commerce
Internet
The Service Provider Edge consists of the public networks that facilitate
wide-area network connectivity:
■ Internet Service Provider (ISP)—Public connectivity
■ Public Switched Telephone Network (PSTN)—Dial up
■ Frame Relay, ATM, and PPP—Private connectivity
Figure 1-4 puts together the various pieces: Campus, Enterprise Edge, and
Service Provider Edge. Security implemented on this model is described in
the Cisco SAFE (Security Architecture for Enterprise) blueprint.