CCNA40-Exploration版本第三学期英文.pptVIP

LAN Design LAN Switching and Wireless – Chapter 1 Objectives Describe how a hierarchical network supports the voice, video and data needs of a small and medium-sized business. Match the appropriate Cisco switch to each layer in the hierarchical network design model. Context Index 1.1 Switched LAN Architecture 1.2 Matching Switches to Specific LAN functions 1.3 Chapter Labs 1.1 Switched LAN Architecture 1.1.1 The Hierarchical Network Model Hierarchical network design involves dividing the network into discrete layers. Each layer provides specific functions that define its role within the overall network. 1.1.1 The Hierarchical Network Model 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. 1.1.1 The Hierarchical Network Model 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. 1.1.1 The Hierarchical Network Model The core layer of the hierarchical design is the high-speed backbone of the internetwork. The core area can also connect to Internet resources. 1.1.1 The Hierarchical Network Model The benefits of the hierarchical network model 1.1.2 Principles of Hierarchical Network Design Network diameter-----Network diameter is the number of switches in the path of traffic between two endpoints. 1.1.2 Principles of Hierarchical Network Design Bandwidth aggregation-----Bandwidth aggregation is normally implemented by combining several parallel links between two switches info one logical link. 1.1.2 Principles of Hierarchical Network Design Redundant Links-----Modern networks use redundant links between hierarchical network layers in order to ensure network availability. 1.1.3 What is a Converged Network? Convergence is the process of combining voice and video communications on a data network. - One benefit of a converged