Computer Networks 01[1 using all terms].pptx

Computer Networks 01[1 using all terms].pptx

• 1.
  A network isdefined as a system for connecting computers using a single transmission technology. The computers can communicate with each other in a network. They can send and receive data from each other when they are in a network. Computer Networks
• 2.
  Computer networks areclassified by four factors which are as follow:  BY SIZE  BY CONNECTIVITY  BY MEDIUM  BY MOBILITY Classification of Networks
• 3.
  BY SIZE : According to their size there are two classifications of networks.  Local Area Network. ( LAN)  In LAN network occupies the smaller area like a room a floor or a building.  Wide Area Network (WAN)  In WAN, network occupies larger areas like cities & countries. Internet is a Wide Area Network.  LAN & WAN are compared by the speed of transmission, bandwidth and latency, management, security, reliability, billing and their standards. Classification of Networks
• 4.
  BY CONNECTIVITY : Networksare also classified by connectivity in which two topologies are discussed.  Point-to-Point  Broadcast Classification of Networks
• 5.
  POINT-TO-POINT:  In Point-to-Pointtopology there are two topologies.  STAR topology  In star topology each computer is connected to a central hub. The communication takes place through the hub.  TREE topology  In Tree topology all computers are connected to each other in such a way that they make a tree. Classification of Networks
• 6.
  BROADCAST:  In broadcasttopology there are further two categories  SATELLITERADIO  In a satellite or radio topology all computers are connected to each other via satellite or radio wave.  RING TOPOLOGY  In a ring topology each computer is connected to other through a ring Classification of Networks
• 7.
  BY MEDIUM: The classificationof networks is also based on the Medium of transmission. Following are the mediums of transmission:  Copper wire  Co-axial cable  Optical fiber  Radio waves Classification of Networks
• 8.
   All thesemediums differ from each other with respect different parameters.  These parameters are speed of transmission, range of the receiver and transmitter computer, sharing of information, topology, installation & maintenance costs and reliability.  For example the range of radio waves will be much more than an optical fiber.  Similarly other mediums differ from each other and appropriate medium is selected for the sake of transmission. Classification of Networks
• 9.
  BY MOBILITY:  Thenetworks are also classified according to their mobility.  In this respect there are two types of networks.  Fixed networks  Mobile networks  Mobile networks have been emerged in the last decade. In this regard there are some issues which are attached with the mobility of networks which are as follows:  Location and tracking  Semi persistent connections  Complex administration and billing as devices and users move around the network Classification of Networks
• 10.
  A computer networkis a complex subject due to the following reasons:  Many Different Technologies Exist  No Single Underlying Theory or Model  Models are Either So Simple or So Complex  No Simple or Uniform Terminology Complexity in Network Systems
• 11.
  To master thecomplexity one must follow the following points.  Concentrate on Understanding the Concepts  Learning the Networking Terminology Mastering the Complexity