• Local-Area Networks
  • Wide-Area Networks
  • The Internet
    		•

    Chapter 1: Computer Systems




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    slides01

    Network Connections

    • Most modern networks share a single communication line
    • Adding a new computer to the network is relatively easy
    • Often information is broken
    • down in parts, called packets,
    • which are sent to the receiving
    • machine then reassembled

    Local-Area Networks

    • LAN
    • A Local-Area Network
    • (LAN) covers a small
    • distance and a small
    • number of computers
    • A LAN often connects the machines
    • in a single room or building

    Wide-Area Networks

    • LAN
    • A Wide-Area Network (WAN)
    • connects two or more LANs,
    • often over long distances
    • LAN

    The Internet

    • The Internet is a WAN which spans the entire planet
    • The word Internet comes from the term internetworking, which implies communication among networks
    • It started as a United States government project, sponsored by the Advanced Research Projects Agency (ARPA), and was originally called the ARPANET
    • The Internet grew quickly throughout the 1980s and 90s
    • Less than 600 computers were connected to the Internet in 1983; now there are over 10 million

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