Collision+broadcast domains

• collision domain - network segment where simul data transmissions collide with each other

  • i.e. all devices in segment have to pay attention to msg even if it was not destined for them
  • causes devices to re-transmit msgs one-by-one if collision occured
  • usually happens in wireless networks, but also early Ethernet
  • only happens in half-duplex mode
  • split by router, switch (not split by hub)

• broadcast domain - domain in which a broadcast is forwarded

  • split by router (not switch, hub)
  • large broadcast domains cause congestion