chapter 1 lan design(1)

8/3/2019 Chapter 1 LAN Design(1)

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

LAN Design

Chapter One


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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 3

Layer 2 devices

A layer 2 device is a device that understand MAC,for example: NIC (Network Interface Card) Bridge :

- address learning- forwarding decisions are based on software- bridge is used for LAN segmentation- max. 16 port.

Switch:

- a multi-port bridge up to 256 port- forwarding decisions are based on hardware ASIC(faster than bridge)


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What is the meaning of switching?

Switching means that the device (router or switch)receive the data on a certain port (Interface) andforwards it to appropriate port (Interface).


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Hierarchical Network Design


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Access Layer :-The main purpose of the access layer is to provide a means of connecting

devices to the network and controlling which devices are allowed to communicate on thenetwork.

Distribution Layer :-The distribution layer aggregates the data received from the access

layer switches before it is transmitted to the core layer for routing to its final destination.VLANs allow you to segment the traffic on a switch into separate subnetworks.

Core Layer :-The core layer of the hierarchical design is the high-speed backbone of the

internetwork. The core layer is critical for interconnectivity between distribution layer devices,so it is important for the core to be highly available and redundant and it must be capable offorwarding large amounts of data quickly.


7/22 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 7

Hierarchical Network Physical Layout



Benefits of a Hierarchical Network



What is the converged network?

Small and medium-sized businesses areembracing the idea of

running voice andvideo services ontheir data networks.



Hierarchical Network Model consideration



Match the Appropriate Cisco Switch to each Layer inthe Hierarchical Network Design Model



Select the appropriate switch features



Access layer switch features



Distribution layer switch features



Core layer switch features


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chapter 1 lan design(1)

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