Nội dung

Networking Overview Copyright 2004 TMA Training Center 1 Contents 1. Introduction to Networking 1 2. OSI Model 3 TCP/IP P 3. Protocol t l 4. LAN 5. WAN 6 Other Concepts 6. Exercises Copyright 2004 TMA Training Center 2 1. Introduction to networking Copyright 2004 TMA Training Center 3 What is networking? „ In the world of computers, networking is the practice of linking two or more computing devices together for the purpose of sharing data. Networks are built with a mix of computer h d hardware and d computer t software. ft Copyright 2004 TMA Training Center 4 What is a network? „ „ A network can consist of two computers connected t d together t th on a desk d k or it can consist i t of many smaller network connected together to form a bigger network across a continent. Networks can be categorized in several different ways „ „ „ The geographic area it spans (LAN, WAN, …) The protocol it uses (ATM, VPN, …) Backbone „ The main wire that connects nodes. The term is often used to describe the main network connections Copyright 2004 TMA Training Center 5 Communication Process Packets Protocols Source Address Medium Copyright 2004 TMA Training Center Destination Address 6 Communication Process (cont.) „ Addresses „ „ „ Media „ „ „ Who are the source and the destination of a communication process? Source Address, Destination Address Where is Wh i the th communication i ti take t k place? l ? Cable, Fiber, Air Protocols „ „ How to make the communication process effectively? Format Procedure Format, Copyright 2004 TMA Training Center 7 Evolution of networking standards SNA Standard Interconnectio Proprietary n Development Simplification TCP/IP DECNET Copyright 2004 TMA Training Center 8 2. OSI MODEL Copyright 2004 TMA Training Center 9 OSI Model „ Researched and developed by the ISO - (International Organization for Standardizations) and ITU-T (International Telecommunication UnionTelecommunications Standards Sector). „ „ 1977: establish a subcommittee to develop a communications architecture. 1984: publish ISO-7498, ISO-7498 the Open System Interconnection (OSI) reference model. Copyright 2004 TMA Training Center 10