Chapter 1: Lan Design
Elements of a Converged Network
A converged network solution for a small-to-medium-sized business supports:
 Call control-Telephone call processing, caller ID, call transfer, hold, and conference
 Voice messaging
 Mobility
 Automated attendant

Borderless Switched Networks
Borderless switched network design principles:
 Hierarchical
 Modular
 Resiliency
 Flexibility

Benefits of a Hierarchical network

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Networkdiameter o How many Switches between2 end points in the network NOT IMPORTANT in hierarchical design (distribution layer separates broadcast domains)
Bandwidthaggregation(= etherchannel) o Dual physical links become1 logical link between switches to increase bandwidth on a link !!
Redundant links (not at access layer because of cost) o Several links between the different layer switches

Role of Switched Networks
Switched networks incorporate the following features:
 Layer 3 functionality
 Quality of service
 IP telephony
 Security
 Wireless networking
 Mobility

Elements Of A Converged Network
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Collaboration is a requirement
To support collaboration, networks employ converged solutions
Data services such as voice systems, IP phones, voice gateways, video support,and video conferencing Call control, voice messaging, mobility and automated attendant are also common features

Switch specifications
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1U (rack units): form factors
PoE: power over Ethernet (for AP, IPphones)
Forwarding rate: how much data the switch can process / second
Wire speed: theoretical max data rate of each port (limited by end device / cable)
Port density: number of ports on 1 switch
Etherchannel: link aggregation (1 logical link)

Multilayer Switching
Deployed in the core and distribution layers
 Can build a routing table
 Supports a few routing protocols
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