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© 2008 Cisco Systems, Inc. All rights reserved.

Cisco Confidential Presentation_ID
Chapter 1: Introduction to Switched
Networks
Routing and Switching
1


Presentation_ID
Chapter 1
1.0 Introduction
1.1 LAN Design
1.2 Switched Environment
1.3 Summary
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Presentation_ID
Chapter 1: Objectives
Upon completion of this chapter, you will be able to:
▪ Describe convergence of data, voice, and video in
the context of switched networks.
▪ Describe a switched network in a small-to-medium-
sized business.
▪ Explain the process of frame forwarding in a
switched network.
▪ Compare a collision domain to a broadcast
domain.
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rights reserved. Cisco Confidential


Presentation_ID
Converged Networks Growing
Complexity of Networks
▪ Our digital world is changing.
▪ Information must be accessed from anywhere in
the world.
▪ Networks must be secure, reliable, and highly
available.
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Presentation_ID
Converged Networks
Elements of a Converged
Network
▪ Collaboration is a requirement.
▪ To support collaboration, networks employ
converged solutions.
▪ Data services include voice systems, IP phones,
voice gateways, video support, and video
conferencing.
▪ Call control, voice messaging, mobility, and
automated attendant are also common features.
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rights reserved. Cisco Confidential


Presentation_ID
Converged Networks Benefits
of a Converged Network
▪ Multiple types of traffic; only one network to
manage.
▪ Substantial savings over installation and
management of separate voice, video, and data
networks.
▪ Integrates IT management.
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Presentation_ID
Converged Networks
Borderless Switched
Networks
▪ The Cisco Borderless Network is a network
architecture that allows organizations to connect
anyone, anywhere, anytime, and on any device
securely, reliably, and seamlessly.
▪ Cisco Borderless Network is designed to address
IT and business challenges, such as supporting the
converged network and changing work patterns.
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rights reserved. Cisco Confidential


Presentation_ID
Converged Networks
Hierarchy in the Borderless
Switched Network
Borderless switched network design guidelines are
built upon the following principles:
▪ Hierarchical
▪ Modularity
▪ Resiliency
▪ Flexibility
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Presentation_ID
Converged Networks Core,
Distribution, Access
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rights reserved. Cisco Confidential


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Switched Networks Role of
Switched Networks
▪ Switching technologies are crucial to network
design.
▪ Switching allow traffic to be sent only where it is
needed in most cases, using fast methods.
▪ A switched LAN:
▪ Allows more flexibility
▪ Allows more traffic management
▪ Supports quality of service, additional security,
wireless, IP telephony, and mobility services
10 © 2008 Cisco Systems, Inc. All
rights reserved. Cisco Confidential