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Data communication - Lecture-01


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This is my first lecture about data communication and its importance,the components of a datacommunication and networks and distributed processing.

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Data communication - Lecture-01

  1. 1. Course Instructor : Sehrish Rafiq Department Of Computer Science University Of Peshawar Data Communications & Networking Lecture-01
  2. 2. Readings recommended  Data Communications & Networking 3rd Edition by Behrouz A.Forouzon  Data & Computer Communications 6th edition by william stallings
  3. 3. Lecture Overview  What is Data communication?  Importance of Data communication  Fundamental characteristics of a data communication system  Components of a data Communication system  Networks & distributed processing
  4. 4. What is Data Communication?  The word data refers to facts,concepts and instructions presented in whatever form is agreed upon by the parties creating and using the data.  In context of computer information systems data are represented by binary information units(or bits) produced and consumed in the form of 0’s and 1’s.  Data Communication is the exchange of data (in the form of 0’s and 1’s) between devices via some form of transmission medium(such as a wire cable).  Local and remote data communication  For data communication to occur the communicating devices must be a part of a communication system made up of a combination of hardware & software.
  5. 5. Why study data communication?  Entertainment  Business  Education & research  Space missions  PC revolution  Telecommunications
  6. 6. Fundamental characteristics of a data communication system  The effectiveness of a data communication system depends on three fundamental characteristics:  Delivery  Accuracy  Timeliness
  7. 7. Components of a Data communication system
  8. 8. Networks  A network is a set of devices(often referred to as nodes) connected by media links.  A node can be a computer, printer or any other device capable of sending and/or receiving data generated by other nodes on the network.  The links connecting the devices are often called communication channels.
  9. 9. Distributed Processing  In distributed processing a task is divided among multiple computers.  Instead of a single large machine being responsible for all aspects of a process,each separate computer handles a subset.  Advantages of distributed processing:  Security/Encapsulation e.g. ATM  Distributed databases e.g. World Wide Web  Faster Problem solving e.g. Encryption Codes  Security through redundancy e.g. space programs  Collaborative processing e.g. Games in a multi-user environment
  10. 10. HAVE A NICE DAY!!!