If we talk about networking, usually the topic is Ethernet networking. Ethernet networking work with method that called CSMA/CD ( Carrier Sense Multiple Accees with Collision Detection). The rule of CSMA/CD like following :
1. Computer will check are there using the cable in network carrier sense).
2. If exist, computer will await shall nothing like computer using the cable in network.
3. When have nothing that use the cable in network, computer soon will deliver the data through network cable.
4. If at the same time, other computer actually also send data, there will be the collision that make data from both computer destroy or fall to pieces. This condition which named as Collision.
5. If actually collision, computer will await within at random and try to deliver his data again until succeed.
So, the conclusion is at one moment, only one computer delivering the data and other computer must be waiting. This occurence which make more and more computer in network hub automatically will progressively make the inefficient and slowly network. CSMA/CD work with half duplex, it’s mean only one appliance can “converse” at one time
