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    Touchpad Plus Ver. 1.1 Class 8: Windows 7 & MS Office 2010
    Touchpad Plus Ver. 1.1 Class 8: Windows 7 & MS Office 2010
    Touchpad Plus Ver. 1.1 Class 8: Windows 7 & MS Office 2010
    Ebook292 pages1 hour

    Touchpad Plus Ver. 1.1 Class 8: Windows 7 & MS Office 2010

    By Nisha Batra

    ()

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    About this ebook

    Touchpad PLUS (Version 1.1) is based on Windows 7 and MS Office 2010. This series contains five sections
    ● Digital World section introduces fundamental and application concepts to embrace computer science and integrate them with other subjects and skills.
    ● Cyber Word section covers Internet literacy and makes the students aware of cybercrime and
    LanguageEnglish
    PublisherOrange Education Pvt Ltd.
    Release dateJun 12, 2024
    ISBN9789390475995
    Touchpad Plus Ver. 1.1 Class 8: Windows 7 & MS Office 2010

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      Book preview

      Touchpad Plus Ver. 1.1 Class 8 - Nisha Batra

      The process of connecting computers and peripheral devices with each other, so that they can exchange data is called computer networking. To do networking, various types of hardware devices, protocols and software are required.

      COMPUTER NETWORK

      The computer network is a system of interconnected computers which can communicate with each other. It allows us to share the resources such as computers and peripherals.

      The computers on the network can communicate with each other as well as work independently. Each computer in a network is called a node. The computers in the network maybe linked through the cable, hub, switch, NIC (Network Interface Card), modem or router.

      There are different kinds of computer networks that work in different ways. Networks may be very small and simple as in a room or they may be complex as a global network like the Internet. There may be wired or wireless connection between computers on the network.

      NEED FOR COMPUTER NETWORK

      Computers and other devices connected on a network help in:

      ★ Resource Sharing: It help the users to share files and hardware devices such as printers, scanners, etc.

      ★ Communication: It helps us to communicate with others through e-mail, video conference, instant messaging, etc.

      ADVANTAGES OF COMPUTER NETWORK

      The advantages of computer network are:

      ★ The information can be easily shared by the people.

      ★ It helps in reducing the cost of hardware.

      ★ Store information on one centralised location.

      ★ Reliability implies backing up of information. If a system crashes, then the information is accessible on another workstation for future use.

      ★ Reduction in installation cost.

      ★ User authentication process to secure the data.

      ★ People will have the accessibility to all the information they need to get and share through e-mails and instant messaging which saves time and money in passing information.

      NETWORK TERMINOLOGY

      Let's learn about the various network terminologies.

      Server

      A server is also called as host computer. It controls the access to the hardware and software on the network. It provides a centralised storage area for the programs, data and information.

      ★ The computer which performs a specific task is called the dedicated server.

      ★ The computer which manages the printers and documents being printed is called the print server.

      The computer which stores and provides the access to a database is called a database server.

      ★ The server which manages the network traffic is called a network server.

      ★ The computer which delivers the requested web pages to our computer is called a web server.

      Client

      It is a computer which depends on the server for all the resources. For example, a server might store a network version of Excel program. Every client on the network can access the Excel program from the server.

      COMPONENTS REQUIRED FOR A NETWORK

      The components needed for a network are:

      ★ Network Interface Card (NIC)

      ★ Hub or switch

      ★ Router

      ★ Modem

      ★ Networking Cable (Ethernet cable)

      Network Interface Card (NIC)

      It is an expansion card which provides the network access to a computer. It allows the computer to connect to a network through a wired or wireless medium.

      Hub or Switch

      A Hub or Switch is hardware device that has various boxes to which the computers, printers and other networking devices are connected. The main function of a hub is to direct information around the network and facilitate communication between all the connected devices.

      Router

      It is a networking device used to connect and facilitate transfer of information between two networks. It is located at the gateways where two networks connect.

      Modem

      It stands for MODULATOR-DEMODULATOR. It is a hardware device that is used to connect a computer to the Internet via a telephone line or a wireless medium. It converts data from digital to analog and vice versa. The process of converting analog signals to digital signals is called modulation. The process of converting digital signals to analog signals is called demodulation.

      Networking Cable

      Networking cable, also known as Ethernet cable is a transmission medium that allows to transport information from one place to other place. There are various types of networking cables such as coaxial cable, twisted pair cable, and optical fiber cable.

      TYPES OF NETWORK

      Different types of networks can classified on the basis of geographical areas covered. There are five types of networks: LAN, MAN, WAN, PAN and CAN.

      LAN (Local Area Network)

      It is a digital communication system that interconnects a larger number of computers and other peripheral devices within a radius of less than 1 km. This type of network is usually preferred for a smaller area such as a school building, computer lab, etc. The total diameter of LAN is not more than 5 km.

      MAN (Metropolitan Area Network)

      This network consists of two or more local area networks or campus area networks together that usually spans several buildings in the same city or town.

      WAN (Wide Area Network)

      It is a digital communication system that interconnects a large number of computers in a wide geographical area. This network may operate on a worldwide or nationwide basis. In such type of network, there may not be physical connection between computers. In WAN telephone lines, microwave, satellite links, etc; can be used as transmission medium.

      PAN (Personal Area Network)

      These are privately owned networks. PAN is used to establish the communication amongst the computers within the range of 20 to 30 feet. It can be wired or wireless.

      CAN (Campus Area Network)

      CAN, also known as Cluster Area Network connects two or more LANs that are limited to specific geographical areas, for example, college campus, office building etc.

      A campus area network is larger than LAN since it may span in multiple buildings within a specified area.

      TOPOLOGY

      Topology refers to the geometric arrangement of computers or nodes in a network. The factors that determine the type of topology are cost, flexibility and reliability. There are five different types of topologies. Let us learn about these in detail.

      Bus Topology

      In this topology, all the nodes are connected to a single common path. It is simple and easy to maintain. Additional nodes can be connected at any point along its length. But this topology suffers from a major disadvantage that fault detection in the topology is very difficult.

      Ring Topology

      In this topology, all the nodes are connected in a circular path. The messages are travelled in clockwise or anti-clockwise direction. Any damage to the cable of any node or device can result in breakdown of the whole network.

      Star Topology

      In this topology, central node acts as a hub to which all the other nodes are connected. As compared to the bus topology, star topology requires more devices and cables. The addition of a new node to a star topology is difficult as it involves a connection all the way to the central node.

      Tree Topology

      In this topology, nodes are connected as branches of a tree where hub acts as a root node. It is very simple in nature as it is easier to add or remove the faulty nodes. But its major disadvantage is that if the root node fails to operate, the entire network is inoperable.

      Mesh Topology

      In this topology, every single node in a network is connected to all the other nodes or computers in the network. There is minimal chances of breakdown in this topology. This topology is mostly used in LANs.

      NETWORK ARCHITECTURE

      The network architecture defines the overall design of the computer network. There are two types of network architectures.

      Peer-to-Peer Network

      It is a network of two or more computers that uses the same type of program to share the data. Each computer is considered to have equal responsibilities and acts like a server to the other computers in the network. It works

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