In this chapter, you learned about modularizing the network, with a focus on the following topics:

■ The hierarchical network model's three layers: access, distribution, and core

■ The Cisco SONA framework that integrates the enterprise-wide network

■ The Cisco Enterprise Architecture functional areas:

— Enterprise Campus: Including the Campus Infrastructure module (composed of the Campus Core layer, the Building Distribution layer, and the Building Access layer) and the Server farm module

— Enterprise Edge: Including the E-commerce module, the Internet Connectivity module, the Remote Access and VPN module, and the WAN and MAN and Site-to-Site VPN module

— Service Provider: Including the Internet Service Provider module, the PSTN module, and the Frame Relay/ATM module

— Enterprise Branch

— Enterprise Data Center

— Enterprise Teleworker

■ The infrastructure services and application networking services used within the Cisco Enterprise Architecture modules

■ Security services to protect network resources and users from internal and external threats

■ High-availability services to ensure adequate connectivity for mission-critical applications

■ Voice services to support VoIP and IP telephony

■ Wireless services to support mobile clients connecting to the enterprise network

■ ANS to make the network aware of the content carried across it and to optimally handle that content

■ Network management protocols and features, including SNMP, MIBs, RMON, NetFlow, CDP, and syslog

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