Sunday, May 31, 2020

Dicuss Computer Network in Details.

Computer Network :

  • Set of serial lines to attach terminals to mainframe?
  • Telephone network carrying voice traffic?
  • Cable network to disseminate video signals?

What Distinguishes a Computer Network?

  • Generality
  • Built from general-purpose programmable hardware
  • Supports a wide range of applications

Applications – Consumers of Networks:

  • On a simple click, several messages may be exchanged over the Internet
  • In a web browser, 17 messages may be exchanged
  1. up to six messages to translate the server name
  2. three messages to set up a TCP connection
  3. four messages to send HTTP “get” request + response
  4. four messages to tear down the TCP connection
  • Moreover, millions of messages are exchanged each day by Internet nodes to make their presence and services known 

Applications – the Driving Force:

  1. Streaming audio and video is an emerging application
  • The source generates and sends the video stream in messages across the Internet
      2. Video-on-demand: reads a preexisting movie
  • One-way data transfer
     3.Videoconferencing: interactive session
  • Very tight timing constraints
    4.Diversity of applications that can be built on top of the Internet hint at the complexity of the
      Internet design


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