Specifications

CHAPTER 1
Campus Network Design
Chapter 1
Campus Network Design
An enterprise campus generally refers to a network in a specific geographic location. It can be within one building or
span multiple buildings near each other. A campus network also includes the Ethernet LAN portions of a network outside
the data center. Large enterprises have multiple campuses connected by a WAN. Using models to describe the network
architecture divides the campus into several internetworking functional areas, thus simplifying design, implementation,
and troubleshooting.
The Hierarchical Design Model
Cisco has used the three-level Hierarchical Design Model for years. The hierarchical design model divides a network into
three layers:
n Access: Provides end-user access to the network. In the LAN, local devices such as phones and computers access
the local network. In the WAN, remote users or sites access the corporate network.
n High availability via hardware such as redundant power supplies and redundant supervisor engines. Software
redundancy via access to redundant default gateways using a first hop redundancy protocol (FHRP).
n Converged network support by providing access to IP phones, computers, and wireless access points. Provides
QoS and multicast support.
n Security through switching tools such as Dynamic ARP Inspection, DHCP snooping, BPDU Guard, port-security,
and IP source guard. Controls network access.
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue
9781587140112.qxd 11/23/09 11:34 AM Page 4
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