The Complete Enterprise Composite Model
CAMPUS BACKBONE
BUILDING ACCESS
1st Floor
2nd Floor
3rd Floor
1st Floor
2nd Floor
3rd Floor
1st Floor
2nd Floor
3rd Floor
SERVER FARM
E-Mail DNS File & Print Directory Database Legacy
Service
Provider Edge
Enterprise Campus Enterprise Edge
Management
Remote Access
Edge WAN
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
Internet
PSTN
Internal Firewall
Internal Firewall
Caching
Firewall
PPP
ATM
Frame Relay
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4th Floor
4th Floor 4th Floor
BUILDING DISTRIBUTION
E-Commerce
Internet
IDC
IDC
IDC
SONA and IIN
Modern converged networks include different traffic types, each with unique
requirements for security, QoS, transmission capacity, and delay. These
include:
■ Voice signaling and bearer
■ Core Application traffic, such as Enterprise Resource Programming
(ERP) or Customer Relationship Management (CRM)
■ Database Transactions
■ Multicast multimedia
■ Network management
■ “Other” traffic, such as web pages, e-mail, and file transfer
Cisco routers are able to implement filtering, compression, prioritization, and
policing (dedicating network capacity). Except for filtering, these capabilities
are referred to collectively as QoS.
Note
The best way to meet capacity requirements is to have twice as much bandwidth as needed.
Financial reality, however, usually requires QoS instead.