Chapter 7-itm.docx

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Information Technology Management
ITM 100
Vikraman Baskaran

Chapter 7-Telecommunications, the Internet, and Wireless Technology Networking and communication trends • Convergence: • Telephone networks and computer networks converging into single digital network using Internet standards • Cable companies providing voice service • Broadband: • 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 Key Digital Network 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: ability of computers and computer-based devices to communicate and share information • Protocol: set of rules and procedures governing transmission of information in a network Signals: digital versus analog • Digital: discrete, binary waveform • Analog: continuous waveform, typically used for voice • A modem converts from one state to the other Physical transmission media • Twisted wire • Coaxial cable • Fibre optics and optical networks • Wireless transmission media and devices • Transmission speed 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) Internet addressing and architecture • Every device connected to the Internet has a unique 32-bit numeric IP address • A Domain Name System (DNS) converts IP addresses to English-like domain names • The domain name is the English-like name that corresponds to the unique 32-bit numeric IP address The Future Internet: IPv6 and Internet 2 • IPv6: allows 128 bit addresses, a quadrillion possible addresses • Internet2: consortia of agencies working to provide an new robust and high-bandwidth version of the Internet Internet Services and Communication Tools •
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