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KEY DATA COMMUNICATION TERMINOLOGY

  • Link: connects adjacent nodes Wires, Cables, Any thing that physically connects two nodes
  • Path: end-to-end route within a network
  • Circuit: the conduit over which data travels
  • Packetzing: dividing messages into fixed-length packets prior to transmission over a network’s communication media
  • Routing: determining a message’s path from sending to receiving nodes
  • The transmission medium may itself be a network, so route needs to be specified
Network
“A NETWORK is a set of devices (Nodes) connected by Communication Links”
  • Node: Can be a Computer, Printer or any other device capable of sending or receiving
  • The links connecting Nodes are called COMMUNICATION CHANNELS Networks- Why we need them?
Networks- Why we need them?
It is often impractical for devices to be directly connected for two major reasons:
  • The devices are very far apart. They are expensive to connect just two devices with one in Lahore and other in Islamabad
  • Large set of devices would need impractical number of connections e .g. Telephone Lines in the world and all the computers owned by a single organization
Solution to the Problem=Networks
  • Solution is to connect all devices to a central system known as a NETWORK in which all terminals or computers share the links.
  • Two Main Classifications of the Networks
  • LANS
  • WANS
DISTRIBUTED PROCESSING
  • Instead of a single large machine being responsible for all aspects of a process ,each separate computer handles a subset of the task
  • Example – Project Given as a part of the Course
  • Example – Office Work
Advantages of Distributed Processing
  • Security
A system designer can limit the kind of interaction that a given user can have with
the entire system.
  • For example : Bank’s ATM
  • Distributed Data bases
No one system need to provide storage capacity for the entire database
  • For example WWW gives user access to pages stored anywhere on Internet
  • Faster Problem Solving
Multiple computers working on a problem can solve a problem faster than a
computer working alone
  • Security through Redundancy
Multiple computers running the same program provide security through redundancy
If one computer's hardware breaks down others cover up
  • Collaborative Processing
Both multiple computers and multiple users can interact for a task

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