Networking - CSC405 Introduction to Computer Security Fall...

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CSC405 Introduction to Computer Security Fall 2007 1 Networking What is a Network? A network is a group of connected computers that allow people to share information and equipment. Network Size A network can be any size. For example, connecting two home computers so they can share data creates a simple network. Companies can have networks consisting of a few dozen computers or hundreds of computers. The Internet is the world’s largest network, consisting of smaller networks, and connecting billions of computers all over the world. Types of Networks LAN – A local Area network (LAN) is the most common type of network found in businesses. Local area networks connect computers and devices to each other, such as in one building. MAN – A Metropolitan Area Network (MAN) is a collection of Local Area Networks. Metropolitan area networks connect computers located in the same geographic area, such as a city or town. For example, a college may use a MAN that connects the local area networks on each campus throughout a city. WAN – A Wide Area Network (WAN) connects local and metropolitan are networks together. The networks that make up a wide area network may be located throughout a country or even around the world. When a single company owns and controls a wide area network, the WAN is often referred to as an enterprise network. The Internet is the largest wide area network. Network Hardware Network hardware includes the physical devices used on a network. All networks require network hardware to function. Computers Resources Cables Connectors Network Interface Cards Network Software Network software consists of programs that manage the network, allow computer to communicate and share information on the network. Network Operating System Network driver Server software Application Software Management Software
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Fall 2007 2 Client/Server Networks A client/server network consists of a central computer that servers information and resources to other computers, called client. Network Structure Network structure, also called network topology , specifies how a network is designed or laid out. A network structure has both a physical level and a logical level . Common Network topologies: Ring, Mesh, Star, Fully Connected, Line, Tree, Bus Networking Hardware continued Servers Storage Devices Printers Network Interface cards Hubs Switches Repeaters Bridges Routers Gateways Modems Transmission Media Transmission media are the physical pathways that connect computers and devices on a network. Cable (coaxial cable, UTP, STP)
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This note was uploaded on 10/13/2008 for the course CSC 405 taught by Professor Carter during the Spring '08 term at N.C. State.

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Networking - CSC405 Introduction to Computer Security Fall...

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