Networks

Networks

1. Types

   • WAN
     • A wide area network (WAN) is a telecommunications network or computer network that extends over a large geographical distance. Wide area networks are often established with leased telecommunication circuits.
   • LAN
     • A local area network (LAN) is a group of computers and associated devices that share a common communications line or wireless link to a server. Typically, a LAN encompasses computers and peripherals connected to a server within a distinct geographic area such as an office or a commercial establishment.

2. Collection of computers connected so they can communicate.

3. Topologies

   • Bus
   • Ring
   • Star
   • Mesh

4. Hardware/ functions

   • Routers
     • A router can form a LAN by connecting devices within a building. It also makes it possible to connect different networks together.
   • Modems
     • A modem enables a computer to connect to the internet over a telephone line. It does this by converting digital signal to analogue signals.
   • Hubs
     • A hub broadcasts data to all devices on a network.
   • Bridges
     • A bridge is used to connect two separate LAN networks
   • Switches
     • A switch performs a similar role to a hub and a bridge but is more powerful.

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