Class Notes (836,128)
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ITM 102 (371)

Chapter 7

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Information Technology Management
ITM 102
Franklyn Prescod

Chapter 7 Networking and Communication Trends – Convergence: • Telephone networks and computer networks converging into single digital network using Internet standards • E.g. cable companies providing voice service – Broadband: • More than 60% Canadian Internet users have broadband access – Broadband wireless: • Voice and data communication as well as Internet access are increasingly taking place over broadband wireless platforms What is a computer network? • Network Interface Card (NIC) • Network Operating System (NOS) • Routes and manages communications on the network and coordinates network resources • Dedicated server computer • Hubs • Routers Networks in Large Companies – Hundreds of local area networks (LANs) linked to firm-wide corporate network – Various powerful servers • Web site • Corporate intranet, extranet • Backend systems – Mobile wireless LANs (Wi-Fi networks) – Videoconferencing system – Telephone network – Wireless cell phones Key Digital Networking Technologies • Client/server computing • Packet Switching • TCP/IP and Connectivity Client/Server Computing • Client/server computing is a distributed processing model in which some processing power is located within small, inexpensive client computers • The clients are linked to one another through a network that is controlled by a network server computer • The server sets the rules of communication for the network and provides every client with an address so others can find it on the network Packet Switching • Messages are first broken down into small bundles of data called packets • Packets are sent along different communication paths as paths become available • Packets are reassembled once they reach their destinations TCP/IP and connectivity • Connectivity between computers enabled by protocols • Rules that govern transmission of information between two points • Transmission Control Protocol/Internet Protocol (TCP/IP) – Common worldwide standard that is basis for Internet • Department of Defense reference model for TCP/IP – Four layers 1. Application layer 2. Transport layer 3. Internet layer 4. Network interface layer Signals: digital versus analog • Digital: discrete, binary waveform • Analog: continuous waveform, typically used for voice • A modem (modulator - demodulator) converts from one state to the other Types of Networks • Local Area Network (LAN) • Campus Area Network (CAN) • Metropolitan Area Network (MAN) • Wide Area Network (WAN) Physical transmission media • Twisted wire • Coaxial cable • Fibre optics and optical networks • Wireless transmission media • Microwave, satellite, cellular • Transmission speed (hertz, bandwidth) What is the Internet? • Links hundreds of thousands of individual networks all over the world • Most homes connect to the internet by subscribing to an Internet Service Provider (ISP) • Digital Subscriber Line (DSL) • Cable Internet connections • T1 and T3 lines Internet Addressing and A
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