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Chapter01 - Chapter 1 Introduction to Local Area Networks...

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Chapter 1: Introduction to Local Area Networks
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What is a LAN? A type of network where nodes are connected at high speed in a confined geographical area. Network: A connection between two or more computers to exchange data or provide shared access to resources Node: Any device that can send or receive data via a network
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Why use a LAN? LANs provide the ability to share resources to other nodes on the network. Resources include: Shared printers Shared files Shared Internet connection Shared applications such as database and e-mail servers
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The First LAN Was built at the Xerox Palo Alto Research Center (PARC) in 1973. Xerox PARC was also responsible for the invention of: o The first personal computer (the Alto) o The first laser printer o The first Graphic User Interface Although Xerox PARC pioneered many of these technologies, other companies, such as Apple, Microsoft, 3Com and Cisco would make them famous.
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Other Types of Networks Campus area network (CAN): Spans a group of buildings, generally within walking distance of each other that belong to the same organization. Metropolitan area network (MAN): Medium speed network that connects sites over distances up to 50 miles. Generally used by organizations that have several locations over the same city.
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WANs are made up of LANs connected by lower speed long distance links. WANs usually cover a significant geographical area. Other Types of Networks Wide area network (WAN):
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Authentication The process by which a user is identified on the network.
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