CSMA/CD

1
CSMA/CD
2
Carrier Sense (CS)

• Computers have the ability to listen to a
  shared communications channel and only transmit
  when it is free.

3
Multiple Access (MA)

• This means that many computers can use the same
  channel without every message smashing into the
  next.

4
Collision Detection (CD)

• If two messages do collide, the computers hear
  this and back off a random period of time before
  re-transmitting

5
CSMA/CD

• Collisions are natural on a Bus Topology.
• However, if there are too many computers on the
  network, the number of collisions will go up and
  the network performance will slow down
  dramatically.