Videos Related with Computer Network and Communication Media

Note on Computer Network and Communication Media

  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz

Computer Network

The group of interconnected computers through transmission media in-order to communicate and share resources like hardware, data and software is known as communication media. It is a system for communication between networks. The computers in the network may be connected through cables,telephone-lines, beams etc.

Advantage of Computer Network

  • The computers on the network can share hardware devices like printer, scanner etc.
  • Data and software can be shared within the computer on the network.
  • Files can be transferred from one computer to another computer.
  • Computers in the network can communicate with each other.

Disadvantages of Computer Network

  • Data and information maybe stolen by computer hackers.
  • If any computer in the network get affected by the virus, there is high chance of spreading computer virus.
  • Computers on the network have to depend on the server.

Types of communication media

There are two main types of communication channels. They are:

1. Guided or Bounded or Wired Communication Media

A transmission media where data signals are transmitted along a specific path through cable is known as Guided Transmission Media. It transfer data from one place to another with the help of wire. There are three types of cables used for wired network. They are:

  • Twisted Pair Cable

    The twisted pair cable consists of a pair of insulated copper wire twisted around each other. The number of twisted pair may 1, 2, 4 or more. The twisted pair cable is mostly used for connecting computers on the network.

    The twisted pair cable comes into two categories:

    1. Unshielded Twisted Pair (UTP):A UTP cable is one of the most popular LAN cables. This cable consists of 4 twisted pairs of metal wires (means there are 8 wires). Adding RJ-45 connector at both ends of the cable, it becomes a LAN cable that we generally use.
    2. Shielded twisted Pair (STP):A shielded twisted pair cable (also known as IBM Type I) is similar to UTP but it has metallic covering placed just underneath the plastic casing. It is more expensive than UTP cables. STP cable offer the best protection from interference. It can support data transfer rate from 16 to 500 Mb/s (millions of bit per second).
  • Co-axial cable

    Coaxial cable have wide bandwidth and noise immunity. These are widely used in long distance telephone lines. It's transmission speed is much higher than twisted pair cables.

  • Fiber optic cable

    Fiber optic cables are made up of plastic or glass fibers and gives high quality transmission of signal at a very high speed. Fiber optic cable transmission are not affected by electromagnetic interference.These can be used to communicate either analog or digital signals. These are most commonly used for point to point one way communication.

2. Unbounded or Unguided or Wireless Communication Media

The way to transfer data without the help of wire is called Unguided media.

Types of Unguided Media

  • Microwave: The way to transfer data straightly from one point to another point in the way of light in the universe is called microwave system.
  • Radio wave: Radio wave transmissions are used for communication between computers in inaccessible locations or for short range communications. The other benefit is the responsibility of reaching rural and hilly area which are not covered by land telephone line.
  • Satellite: Satellite communications are like microwave and has relay stations in the sky. Transponders on the satellite are used to receive and re-transmit signals sent from earth stations. A transponder has a very high capacity and can handle more than 400 channels.

 
  • There are two types of communication media. They are Guided or Bounded or Wired Communication Media and Unguided or Unbounded or Wireless Communication Media.
  • The twisted pair cable consists of a pair of insulated copper wire twisted around each other. 
  • A transmission media where data signals are transmitted along a specific path through cable is known as Guided Transmission Media. 
  • The group of interconnected computers through transmission media in-order to communicate and share resources like hardware, data and software is known as communication media.
.

Very Short Questions

A communication media is the path through which data, information and files transfers from one computer to other computer in the form of electromagnetic wave i.e. electric signals.
The main two communication media are as follows:

  • Guided Transmission Media
  • Unguided Transmission Media

Guided transmission media is such a transmission media where signals are transmitted along a specific path through cable.
Any three guided transmission media are as follows:

  • Coaxial Cable
  • Twisted Pair Cable
  • Fiber Optical Cable

Unguided transmission media is such a media where information is transmitted by sending electromagnetic signals through free space, as the signals are not guided in any specific direction or inside any specific medium.
Any three unguided transmission media are:

  • Radio Wave
  • Infrared
  • Microwave

An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are typically individually coated with plastics layers and contained in a protective tube suitable for the environment where the cable will be deployed. The data travels at a very high speed in the form of light.

A type of wire that consists of a center wire surrounded by insulation and then a grounded shield of braided wire. The shield minimizes electrical and radio frequency interface. Coaxial cabling is the primary type of cabling used by the cable television industry and is also widely used in computer networks, such as Ethernet.

An UTP cable is one of the most popular LAN cables. This cable consists of 4 twisted pairs of metal wires(that means there are 8 wires in the cable). RJ45 connectors are used in UTP cables.

The most powerful computer on the network, which does all the processing for the user is known as host computer.

Terminal is a specialized network device on a host-based network that transmits the data entered by the user to the host for processing and displays the results.

0%
  • Which of the following is an example of unbounded communication media?

    Co-axial Cable
    UTP
    Fiber Optics
    Microwave
  • What is the full form UTP?

    Unshielded Twisted Pair
    Unshielded To Pair
    Uniform Transferred Protocol
    Unshielded Transfer Pair
  • Twisted Pair is an example of :

    Wireless Communication Media
    Unbounded Communication Media
    Unguided Communication Media
    Guided Communication Media
  • ____________are used for communication between computers in inaccessible locations or for short range communications.

    Micro wave
    Satellite
    None of them
    Radio wave
  • ______________ are made up of plastic or glass fibers and gives high quality transmission of signal at a very high speed.

    Unshielded Twisted Pair
    Coaxial cable
    Fiber optic cables
    Shielded twisted Pair
  • What is Transmission Media?

    Powerful and wide ranging network.
    Channel through which the data travels in a network.
    One direction topology.
    Network where there is no central authority.
  • What is Coaxial Cable?

    Cable used in coax ethernet networks
    Cable used on ARC net and IBM terminals
    Cable used frequently as a backbone
    Cable made up of single upper wire
  • What is fiber optics?

    Common type of network cable.
    Cable used on ARC net and IBM terminals.
    Channel through which the data travels in a network.
    Major networks system that support fiber-optic cabling.
  • What is twisted pair cable?

    Cable used on ARC net and IBM terminals
    Common type of network cable
    Major network system that support fibre cabling
    Channel through which the data travels in a network
  • (Fundamentals-22 Marks) 1. Answer the following questions(???? ???????? ????? ???????? /): 10 a. Define star topology with figure.(????? ?????????? ?????? ?????? ???? ???????? ???????? / ) b. Write any four services of internet.(?????????? ???? ? ??????? ????????? /) c. What do you mean by computer ethics?(????????? ??????? ??????? ?? ??????????? /) d. Discuss about defragmentation.(??????????????? ?? ?????? ????? ????????? /) e. Write any four mechanisms to protect the computer from computer viruses.(????????? ????? ??? ????? ???? ? ???????? ?????? ????????? /). 2. a .Convert as indicated(???????? ??? ?????? ????????? /): 4 i. (AB3)16=(...?...)10 ii. (547)8=(…?...)2 b. Perform the following binary calculations(?????? ????? ???????? /) i. 10100-1111+101 ii. Divide 10111 by 101 3. Match the following(???? ?????????? / ) 2 a. LAN Software security b. Client/server Hardware security c. Back up Network type d. Fire control Network architecture Computer Virus 4. True or False(??? ? ??? ????????????? ): 2 a. Router is a network device to regenerate a signal.(????? ?? ??????? ?? ?????? ??????????? ????? /) b. UPS protests our computer against voltage fluctuation.(??????? ??????? ???? ???? ?????? ???? /). c. Microphone is essential in multimedia.(?????????? ??????????? ?? ???? ?????????? ????? / ) d. Copy right law is one of the laws of cyber law.(??????? ???? ????? ???? ????? ?? ?? ?? /) 5. Write the technical terms(????????? ????????? ?????????? /): 2 a. Data communication which is possible in one way only.(?? ??? ????? ???? ????? ????? ) b. Network of network owned by particular organization.(???? ????? ?? ?????? ??????? ??? ?? ??? ??????? ) c. A program designed to detect and remove the destructive computer program.(???? ???? ????????? ????? ??????? ????????? ) d. A moving graphics.(?????? ????????? /) 6. Write the full forms of(???? ??? ?????????? /): 2 CAL, POP, UPS, MUK Group B (Database Management System-10 Marks) 7. Answer the following questions(???? ???????? ????? ???????? /): 6 a. Write the difference between Memo field and Text field.(???? ? ??????? ????? ?? ??? ?????????? /) b. Define Form and Report.(???? ? ??????? ?? ?????? ???? ???????? /) c. Define Sorting and Filtering.(??????? ? ????????? ?? ?????? ???? ???????? /) 8. True or False (??? ? ??? ????????????? ) 2 a. A record is the collection of field.(?????? ????? ????? ??? ?? ????? ?? /) b. Date and time field occupies 11 bytes.(??? ? ???? ????? ?? ?? ????? ????? /) c. Update is a type of action query.(????? ????? ?????? ?? ?? ?????? ?? /) d. Long integer is the default data type of Number field.(????? ????? ?? ?????? ???? ?????? long integer ?? /) 9. Match the following(???? ?????????? / ) : 2 a. Telephone directory Field property b. Oracle Unique Value c. Index DBMS d. Primary key Database Field Size Group C (Programming -18 Marks) 10. Answer the following questions(???? ???????? ????? ???????? /): 3 a. Write any two data types of C programming language.(?? ??????????? ?? ???? ? ???? ?????? ??? ?????? ???? /) b. Write the syntax of sub procedure.(Sub Procedure ?? ??? ?????????? ) c. Write the functions of following statement:(?????? ???????????? ????? ?????????? / ) i. KILL ii. EOF 11. Debug the following program(???? ???????????? ??????? ???: ??????????) 2 REM TO DISPLAY THE RECORDS CLS OPEN “STUDENT.TXT” FOR OUTPUT AS #1 WHILE NOT EOF(#1) INPUT NAME$,AGE,ADD$ PRINT NAME, AGE, ADD WEND CLOSE #1 END 12. Find out the output of the following program(?????? ????????? ?? ?????? ?????????? ) : 2 DECLARE FUNCTION CHECK(A) CLS PRINT CHECK(4387) END FUNCTION CHECK(A) WHILE A<>0 R=A MOD 10 IF R MOD 2=0 THEN S=S+R END IF A=A10 WEND CHECK=S END FUNTION 13. Read the given program and answer the given questions(???? ????????? ?????? ??? ??????? ??????????? ????? ?????????? / )2 DECLARE SUB CHECK() CLS CALL CHECK() END SUB CHECK A=1 FOR I= 1 TO 5 PRINT A A=A+3 NEXT I END SUB a. Write the name of the procedure used in the above program. (?????? ????????? ?? ?????? ???? ????????? ?? ??? ?????????? / ) b. What will happen if CALL statement is missing?(?????? ????????? ?? CALL ?????????? ?????? ?? ????? ) 14. Write the QBASIC code for the following(QBASIC ??? ?????????? /): a. Write a program to find out the factorial of a number by using SUB … END SUB. (SUB ... END SUB ?????? ??? ?????? ???????? ???????????? ????? ????????? /) b. Write a program to find out the number is odd or even by using Function procedure.(FUNCTION ... END FUNCTION ?????? ??? ?????? ?????? ??? ?? ????? ????? ?????? ???? /) c. Write a program to read all the records from the data file “STUDENT.TXT” and display all the records where the fields name are unknown.(STUDENT.TXT ?? ???? ??? ???? ??? ??????????? ???? ??????? ??? ??? ???? ??? / ) Best of Luck

  • You scored /10


    Take test again

DISCUSSIONS ABOUT THIS NOTE

You must login to reply

Forum Time Replies Report

What is band width


You must login to reply