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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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2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE 1 Chapter 6 3
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
The Hierarchical Network Model
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2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE 1 Chapter 6 5
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)
The Hierarchical Network Model
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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
The Hierarchical Network Model
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The hierarchical network model Physical layout
The Hierarchical Network Model
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Benefits of the hierarchical network model
The Hierarchical Network Model
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Hierarchical network design: network diameter
The Hierarchical Network Model
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Hierarchical network design: bandwidth aggregation
The Hierarchical Network Model
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Hierarchical network design: redundant links
The Hierarchical Network Model
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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
The Hierarchical Network Model
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Separated Networks
The Hierarchical Network Model
Video
Voice
Data
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Converged Networks
The Hierarchical Network Model
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Considerations for Hierarchical Network Switches
The Hierarchical Network Model
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Considerations for Hierarchical Network Switches
The Hierarchical Network Model
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Considerations for Hierarchical Network Switches
The Hierarchical Network Model
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Topology Diagrams:- shows switches and its connections
- switch ports are represented
- user communities
The Hierarchical Network Model
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Cisco Switches and the Hierarchical Network
Design Model
Key features of switches that are used in hierarchicalnetworks
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Cisco Switches and the Hierarchical Network
Design Model
Considerations used to select a switch for a H.N.:
(1) Port density, (2) Forwarding rates, (3) Link Aggregation
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Cisco Switches and the Hierarchical Network
Design Model
Considerations used to select a switch for a H.N.:
(4) Power over Ethernet (PoE), (5) Layer 3 Functionality
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Cisco Switches and the Hierarchical Network
Design Model
Switch features in a hierarchical network
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Cisco Switches and the Hierarchical Network
Design Model
Switch features in a hierarchical network
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Cisco Switches and the Hierarchical Network
Design Model
Switch features in a hierarchical network
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Cisco Switches and the Hierarchical Network
Design Model
Cisco switches used in SMB applications
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2006 Cisco Systems, Inc. All rights reserved. Cisco Publ icITE 1 Chapter 6 26
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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