Exploration LAN Switching Chapter1

7/28/2019 Exploration LAN Switching Chapter1

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2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE I Chapter 6 1

LAN Design

LAN Switching and Wireless Chapter 1


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2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE 1 Chapter 6 2

Objectives

Describe how a hierarchical network supports the voice,video and data needs of a small and medium-sizedbusiness.

Match the appropriate Cisco switch to each layer in the

hierarchical network design model.


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The Hierarchical Network Model

The hierarchical network model:

Involves dividing the network into discrete layers:

Access, Distribution, Core

Benefits:

modular design, scalable, improved performance


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The Core Layer:

The high-speed backbone of the internetwork

Highly available and redundant

Aggregates the traffic from all distribution layer devices



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The Distribution Layer:

Aggregates data received from the access layer devices (switches)before it is transmitted to the core layer for routing

Controls network traffic using policies

Delineates broadcast domains (VLANs)



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The Access Layer:

Interfaces with end devices (PCs, printers, IP phones)

Controlls which devices are allowed to communicate on the network

Includes switches, hubs, wireless access points



7/27 2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE 1 Chapter 6 7

The hierarchical network model Physical layout




Benefits of the hierarchical network model




Hierarchical network design: network diameter




Hierarchical network design: bandwidth aggregation




Hierarchical network design: redundant links




Converged Networks: convergence is the process ofcombining voice, video and data on a data network

Quality of Service (QoS) plays an important role

Difficult (cost) if already invested in 3 separate networks

Benefit: only one network to manage




Separated Networks


Video

Voice

Data



Converged Networks




Considerations for Hierarchical Network Switches




Topology Diagrams:- shows switches and its connections

- switch ports are represented

- user communities




Cisco Switches and the Hierarchical Network

Design Model

Key features of switches that are used in hierarchicalnetworks




Design Model

Considerations used to select a switch for a H.N.:

(1) Port density, (2) Forwarding rates, (3) Link Aggregation




Design Model

Considerations used to select a switch for a H.N.:

(4) Power over Ethernet (PoE), (5) Layer 3 Functionality




Design Model

Switch features in a hierarchical network




Design Model



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Design Model

Cisco switches used in SMB applications


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Summary

Hierarchical Design model addresses performance,scalability, maintainability & manageability issues.

Traffic Analysis is used to monitor network performance.

Hierarchical Design Model is composed of 3 layers:

Access

Distribution

Core

Switches selected for each layer must meet the needs ofeach hierarchical layer as well as the needs of the business.


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Documents

Exploration LAN Switching Chapter1