Solutions for Class 9 Computer on Extramarks

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COMMUNICATION TECHNOLOGYCLASS-9
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What is COMMUNICATION TECHNOLOGY?

• A computer network connects two or more
  autonomous computers. Networks supply their users
  with communication channels. Exchange of messages
  is controlled by communication protocols.
  Networking is needed to share computer files, to
  share computer peripheral, to enable different
  computers to communicate with each other.
• The three main components of network are the
  sender, communication channel and the receiver.
• When computers are connected via telephones, a
  modem is also used to convert the computer
  generated signal (digital signal) into a form
  that can be carried by telephone cables (analog
  signal). When the cables connect two or mo ore
  workstations it is known as transmission media or
  communication channels of network
• The communication media is divided in two
  categories guided media and unguided media. The
  three basic types of Guided Media are Twisted
  Pair, Coaxial Cable and Optical Fibre. Twisted
  pair cable consists of two identical wires
  wrapped together in a double helix

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Extramarks Approach

• Computer Science is an interesting subject and
  has been catching the attention and focus of the
  students for a very long time. Solutions to the
  questions in the book can be really helpful for
  the students in order to learn better. With CBSE
  class 9 computer book solutions on Extramarks
  students can understand the textbook questions
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• For more information visit and register at
  Extramarks website.
• https//www.extramarks.com/ncert-solutions/cbse-cl
  ass-9/foundation-of-information-technology-communi
  cation-technology

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