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Computer Network

Computer Network



This is a Secondary 1 N(T) lesson

This is a Secondary 1 N(T) lesson



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    Computer Network Computer Network Presentation Transcript

    • Objectives
      • Identify the components of a network
      • State the difference between a local area network (LAN) and a wide area network (WAN)
      • State that computers in a network can share information and resources such as documents, databases, software and Printers
      • State that computers in different locations in the world are linked together to form a global network — the Internet
    • 2.1 What is a Network? Simple Definition: It is where computers or devices exchange data with one another. Another definition: It is any collection of independent computers or devices that communicate with one another over a shared network medium.
    • 2.2 Components of a Network? A network is simply a group of devices that are inter-connected. Some examples of these devices are: • Computers • Scanners • Printers • Modems
    • 2.2 Components of a Network? The function of a network is to pass information between devices that are connected. The network may be formed by using: • Copper cables • Radio waves • Fibre-optic cables • Infra-red rays Share printers and servers Share resources Share files and documents Share information E-mail, chat Communicate Examples Purpose
    • 2.2 Components of a Network? Network Interface Cards
      • It provides a connection between the network cable and the computer.
      • There are also other types of devices that your computer uses to connect to a network.
      • E.g. USB (Universal Serial Bus) modem, or a USB wireless network device.
      Network Interface Card USB modem USB wireless network device
    • Hub 2.2 Components of a Network?
      • The hub plays a role in connecting different computers together.
      • All members of the network share the same media to transmit data onto a single network. This means that each member will only get a percentage of the available network bandwidth.
      • Bandwidth is the maximum amount
      • of data that can be transmitted along
      • a channel in one second.
    • 2.2 Components of a Network? Cables
      • Network cables are used to connect the computers and devices together.
      • These cables carry the data that is sent in the network.
    • 2.3 Types of Networks
      • Local Area Network (LAN)
        • Usually confined to a small geographical area
        • Can be small (linking as few as 3 computers) or large (linking as many as a hundred computers)
      • Metropolitan Area Network (MAN)
        • Connects 2 or more LANs
        • Usually covers an entire metropolitan area (E.g. a large city and its suburbs)
      • Wide Area Network (WAN)
        • Connects multiple LANs and MANs that are located in different places
        • WANs can be created by connecting different LANs and MANs using data services (E.g. leased phone lines, dial-up phone lines, etc.)
    • 2.2 The Internet Definition: It is a system of networks that are linked worldwide and facilitate data and communication services. Examples of communication services include file transfer, electronic mail (E-mail) and World Wide Web. Internet
    • 2.2 The Internet Definition: It is a network that contains Internet-type tools, but available only within an organisation. Intranet
      • A network allows computers or devices to exchange data with one another.
      • LAN, MAN, WAN
      • The Internet is a system of networks that is linked worldwide and facilitates data communication services
      Requires data services to connect Does not matter Very large area WAN - Does not matter Large area MAN - Does not matter Small area LAN Other difference Number of users Geographical area 3.
      • A network is a collection of devices used to share information and resources.
      • There are 3 type of network: Local Area Network (LAN), Metreopolitan Area (MAN) and Wide Area Network (WAN).
      • The Internet is a network of computers at different locations around the world.
      • An intranet is a computer network within an organisation. It is like an internal Internet.