Enterprise Composite Network Model
The newer Cisco model—the Enterprise Composite Model—is significantly
more complex and attempts to address the shortcomings of the Hierarchical
Design Model by expanding the older version and making specific recommendations
about how and where certain network functions should be implemented.
This model is based on the principles described in the Cisco
Architecture for Voice, Video, and Integrated Data (AVVID).
The Enterprise Composite Model is broken into three large sections:
■ Enterprise Campus
■ Enterprise Edge
■ Service Provider Edge
The first section, the Enterprise Campus, looks like the old Hierarchical
Design Model with added details. It features six sections:
■ Campus Backbone
■ Building Distribution
■ Building Access
■ Management
■ Edge Distribution—A distribution layer out to the WAN
■ Server Farm—For Enterprise services
The Enterprise Edge details the connections from the campus to the Wide
Area Network and includes:
■ E-commerce
■ Internet connectivity
■ Remote access
■ WAN
The Service Provider Edge is just a list of the public networks that facilitate
wide-area connectivity. These include:
■ Internet service providers (ISP)
■ Analog phone dialup
■ Frame Relay, ATM, and PPP, which have private connectivity
Figure 1-3 shows the Campus, Enterprise Edge, and Service Provider Edge
modules assembled. Security implemented on this model is described in the
Cisco SAFE (Security Architecture for Enterprise) blueprint.
Figure 1-3 Enterprise Design
CCNP ONT
[ 252 ] CCNP ONT Quick Reference
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