Computer Networks

class 7 – chapter 1

Computer network

What is a Computer Network?

A computer network is a group of two or more computers and devices connected together to share information, files, and resources like printers and the internet.
It helps people communicate and work together easily.

Advantages of a Computer Network
  1. It helps in sharing files, data, and information between computers.
  2. Devices like printers and internet can be shared by many users.
  3. It makes communication fast through email and messages.
  4. It saves time and cost by sharing resources.
  5. It helps students and teachers work together easily.
what are the components of a computer network ?
  1. Components of a Computer Network
    • Computers (Nodes) – Devices like computers, laptops, and mobiles connected in a network.
    • Transmission Media – Wires (cables) or wireless signals used to send data.
    • Networking Devices – Devices like hub, switch, router, and modem that connect computers.
    • Network Interface Card (NIC) – A card that helps a computer connect to a network.
    • Software & Protocols – Programs and rules that control network communication.

what are the components of a data communication ?

Components of Data Communication

  1. Sender – The device that sends the data.
  2. Receiver – The device that receives the data.
  3. Message – The information or data to be sent.
  4. Transmission Medium – The path through which data travels (wire or wireless).
  5. Protocol – The set of rules that control data communication.
what are the methods of data transmission ?

Methods of Data Transmission

  1. Simplex – Data flows in one direction only (e.g., keyboard to computer).
  2. Half Duplex – Data flows in both directions, but one at a time (e.g., walkie-talkie).
  3. Full Duplex – Data flows in both directions at the same time (e.g., mobile phone call).

what is infrared wave transmission? write its advantages and disadvantages

Infrared Wave Transmission

Infrared wave transmission is a method of wireless data transmission that uses infrared rays to send data between devices over a short distance. It is used in devices like TV remote controls and short-range communication.

Advantages:

  1. It is easy to use and low cost.
  2. It does not cause interference with radio waves.
  3. It is suitable for short-distance communication.

Disadvantages:

  1. It works only for a short range.
  2. It cannot pass through walls or obstacles.
  3. Sunlight and bright light can disturb the signal.

What is Bluetooth?

Bluetooth is a wireless communication technology used to connect devices over a short distance.
It is used to connect mobiles, earphones, speakers, keyboards, and computers without wires.

Advantages:

  1. It is wireless, so no cables are needed.
  2. It is easy to use and portable.
  3. It uses low power and saves battery.

Disadvantages:

  1. It works only for short distances.
  2. Data transfer speed is slow compared to Wi-Fi.
  3. It can face interference from other wireless devices.

What are the difference type of computer network?

Different Types of Computer Networks

  1. LAN (Local Area Network)
    A LAN connects computers within a small area like a classroom, school, office, or building.
    It is fast and used to share files, printers, and internet within a short distance.
  2. MAN (Metropolitan Area Network)
    A MAN covers a large area like a town or city.
    It connects many LANs of different buildings or schools in a city.
  3. WAN (Wide Area Network)
    A WAN covers a very large area like a country or the whole world.
    The Internet is the best example of a WAN. It connects people globally.
  4. PAN (Personal Area Network)
    A PAN connects personal devices like mobile, laptop, earphones, and smartwatch.
    It works within a very short range, usually using Bluetooth.

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