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Note on Communication and Data Transmission Modes

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A computer network is a logical or physical interconnection between two or more computers such that they could communicate with each other. The process of transferring data between computers is known as data communication. The data and information can be transmitted over significant distances through computer network. The communication of data and information over significant distances is known as telecommunication.

Data Transmission Modes

There are three modes for transmitting data from one device to another.They are as follows:

1. Simplex

The transmission of data can take place in only one direction in a simplex. The simplex device can send only or receive only. The transmission of data through radios, televisions etc are examples of simplex.

2. Half Duplex

Data can be transmitted in both directions, but only one at a time in half duplex. A half duplex device can alternately send and receive data. The transmission of data through walkie-talkie is an example of half duplex.

3. Full Duplex

A full duplex device can transmit data in both directions at a time. It improves the efficiency as it can transmit data in both directions at a time. The transmission of data through telephones is an example of full duplex.

  • A computer network is a logical or physical interconnection between two or more computers such that they could communicate with each other.
  • . The communication of data and information over significant distances is known as telecommunication.
  • The process of transferring data between computers is known as data communication.
  • There are three modes for transmitting data from one device to another.They are simplex, half duplex and full duplex.
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Very Short Questions

The data and information produced by the computer may need to transfer to other computers. The process of transferring data or information between computers is known as data communication.

The communication i.e. transferring of data and information over significant distances is known as telecommunication.

There are three modes for transferring data from one device to another. They are:

  • Simplex

In simplex, the communication can takes place in only one direction. The simplex device can send only or receive data only. The transmission of data through radios, televisions is simplex.

  • Half Duplex

In half duplex system, data can be transmitted in both directions, only in one direction at a time. A half-duplex device can alternately send and receive data. The transmission of data through walkie-talkie is half-duplex.

  • Full Duplex

A full-duplex device can transmit data in both directions at a time. The transmission of data through telephone is Full Duplex.

Computer network is a group of interconnected computers through transmission media in order to communicate and share resources like hardware, data and software.
Any three advantages of computer network are:

  • Data and software of computer can be shared with other computer on the network.
  • Only the authorized user of a network can use the facilities of the network.
  • Computers on the network can communicate with each other.

Computer Networks can allow businesses to reduce expenses and improve efficiency by sharing data and common equipment, such as printers, among many different computers. At the same time, the network may be connected through cables, telephone lines, infrared beams etc, which is cheaper and helps to reduce the expenses.

The disadvantages of computer network are:

  • Data and information may be stolen by computer hackers if the security of network is not reliable.
  • If any computer in a network gets affected by computer virus, there is high chance of spreading computer viruses on the other computer.
  • Computers on the network have to depend on the server computer for resources.
  • This sharing of information may leak the privacy of other clients.

A communication protocol is a set of rules by which computers on the network communicate with each other.
Any four protocols used on the networks are as follows:

  • FTP ( File Transfer Protocol)
  • TCP/IP (Transmission Control Protocol/ Internet Protocol)
  • POP (Post Office Protocol)
  • HTTP ( Hypertext Transfer Protocol)

Switch Bridge Packet forwarding in Switches are performed using ASICs (Application Specific Integrated Circuits). Packet forwarding in Bridges are performed using software. Work at higher speed. Work at lower speed. Switches have more ports. Bridges have less port. Switches can operate on half and full duplex mode. Bridges can operate on half duplex mode only. Router Gateways Coordinates data transfer within internal network. Coordinates data transfer from internal network to internet. All the functionalty of gateways are in router. Gateways are integrated into the router. Always have to have a hardware to function. Some softwares also can perform as gateways.

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  • ________ is a logical or physical interconnection between two or more computers such that they could communicate with each other.

    None of them.
    Communication of Computer
    Computer Network
    Telecommunication
  • Data can be transmitted in both directions, but only one at a time in ______________.

    duplex
    half duplex
    simplex
    full duplex
  • In which mode the transmission of data can take place in only one direction?

    Duplex
    Simplex
    Half duplex
    Full duplex
  • The transmission of data through telephones is an example of:

    None of them.
    Full duplex
    Simplex
    Half duplex
  • Define Telecommunication.

    The process of transferring data between computers.
    The communication of data and information over significant distances.
    None of them.
    Physical interconnection between two or more computers such that they could communicate with each other.
  • What is computer networks?

    Largest network.
    Network that supports many users.
    Multiple nodes of computer which are connected with each other.
    Connection of two or more than two computer.
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rahul

Match the following A Ba. Bluetooth i.Computer securityb. Salami saving ii.A cyber crimec. Coaxial iii.A web browserd. Spike Guard iv.Thicknet v. Wave based communication


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