© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 1 LAN Design Chapter One

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 2 Objectives 1.Describe The Hierarchical Network Model 2.Match the appropriate Cisco switch to each layer in the hierarchical network design model.

© 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)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 4 What is the meaning of switching?  Switching means that the device (router or switch) receive the data on a certain port (Interface) and forwards it to appropriate port (Interface).

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 Hierarchical Network Design

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 6 Hierarchical Network Design 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 the network. 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 of forwarding large amounts of data quickly.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 Hierarchical Network Physical Layout

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 Benefits of a Hierarchical Network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 Hierarchical Network Design

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 10 Hierarchical Network Design

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 11 Hierarchical Network Design

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 12 Hierarchical Network Design

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 What is the converged network?  Small and medium- sized businesses are embracing the idea of running voice and video services on their data networks.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 14

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 15 Hierarchical Network Model consideration

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 16 Match the Appropriate Cisco Switch to each Layer in the Hierarchical Network Design Model

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 17 Select the appropriate switch features

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 18 Select the appropriate switch features

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 19 Access layer switch features

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 20 Distribution layer switch features

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 21 Core layer switch features

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