Networks

Networks

1. The Internet

   • Devices needed to connect
     • Modem
       • Convert digital signals to analogue
         • Digital Signals are from a computer
         • Analogue signals are from a Phone lines
     • Router
       • A router allows you to connect several devices to the iternet
       • Many routers incorporate a wireless Access Point (AP),
   • Packets
     • Types of Packets
       • The IP (Internet Protocol) address it is going to
       • The IP address it has come from
       • The sequence number of the packet
       • The number of packets in the whole communication
   • Protocol
     • The set of rules is called a protocol
       • TCP (Transmission Control Protocol)
         • Breaks up messages sent over the Internet into small chunks called packets
         • Reassembles the packets at the other end
         • Detects errors
         • Resends lost messages
       • IP (Internet Protocol)
         • Routes the individual packets
   • Definition
     • inter-connected computer networks
   • How to connect
     • PC --> Router --> Modem --> ISP --> Internet

2. Network topologies

   • WAN
     • communicate using resources supplied by a “third party carrier”
     • uses cables, telephone lines, satellites and radio waves to connect
     • Spread over a large area
   • LAN
     • single site such as a school
     • Local Area Network
   • Types of Lans
     • Bus
     • Ring

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