Introduction to Computer Networks

• Computer network


  A set of nodes connected by communication links
• Nodes


  • Devices capable of sending or receiving data (e.g. computers, printers, security cameras, switches, bridges, routers)
• Communication links

  • Wired links (e.g. cables) or wireless links (e.g. air)
• Computer networks are mainly used for resource sharing
• End devices


  • Computers
  • Printers
  • Tablets
  • Smartphones
  • Cell phone tower
• Intermediary devices


  • Switches
  • Routers
  • Internet cloud
• End devices are the source or destination in communication
• Intermediary devices forward data from one side to another
• Networking supports the way we learn, communicate, work, and play