1.3 computer networks

1.3 computer networks

1. wired networks

   • cable types
     • ethernet- uses wires to carry electrical signals between devices (most common in LAN)
     • fibre optic- uses beams of light instead of electrical signals and are used for high speed connections between switches, and in many LANs.
   • advantages
     • ethernet networks are more secure, as you need physical access to the cables to get into the network
     • the connections are more stable, faster and are less susceptible to interference
   • disadvantages
     • ethernet cables require physical cables to be connected
     • cables can also be trip hazards

2. wireless connections

   • wireless connections use radio waves to transmit data through the air
   • wi-fi
     • most common type of wireless used in a LAN, devices communicate with a wireless access point (WAP)
     • advanatges
       • ease of movement (no restricted to wire range)
       • you don't need to purchase extra cables for each device and most devices come with a wi-fi adapter built in
     • disadvantages
       • vulnerable to hacking as the radio waves can be intercepted by anyone within range
       • walls or obstructions will reduce the signal strength, and many electrical objects e.g microwaves will cause interference