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  1. 1. ow Circuit-Switched Digital Networks Wo About Ethernet About ISDN About TCP/IP About LAN . – p.1/6
  2. 2. About Ethernet Ethernet is a family of frame-based computer networking technologies for local area networks (LANs). The name comes from the physical concept of the ether. . – p.2/6
  3. 3. About ISDN ISDN is a circuit-switched telephone network system, that also provides access to packet switched networks, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better voice quality than an analog phone. . – p.3/6
  4. 4. About TCP/IP The Internet Protocol Suite (commonly TCP/IP) is the set of communications protocols used for the Internet and other similar networks. It is named from two of the most important protocols in it: the Transmission Control Protocol (TCP) and the Internet Protocol (IP), which were the first two networking protocols defined in this standard. . – p.4/6
  5. 5. About LAN A local area network (LAN) is a computer network covering a small physical area, like a home, office, or small group of buildings, such as a school, or an airport. . – p.5/6
  6. 6. Referance Wikipedia : http://ja.wikipedia.org Yahoo : http://image-search.yahoo.co.jp/ . – p.6/6

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