What Is Data Collision?
You may have heard that are instances in space where one planet, star, or even rubble collides in mid-space with such ferocity that it can be viewed from earth. Given with a telescope, but yes can be visible, and the same principle applies here as well. Data collisions are like the worst-case scenario in a game of telephone. You have a bunch of people sitting around a circle, whispering something to the person next to them. When it's time for the message to come back around, it's all jumbled up and hard to understand! So, then you have people shouting out different versions of what was said before until someone finally says something that sounds right. Data collisions are like that. When two devices send data precisely simultaneously, those packets get broken into fragments and retransmitted. Then the receiver has to try and put everything back together again, but since the packets were broken up, it can't be sure which packets belong. So, all these extra packets don't make sense… kind of like when everyone shouted out different versions of what was said before! In the middle of a busy street, there is a traffic light. It turns green, and a car attempts to drive through the intersection. As it moves forward, it senses that there are no other vehicles in the conjunction and that its signals have not yet turned green. So, it stops just in case some other car might be coming through. When trying to send a data packet to another node, a node checks whether the network is available. In addition to verifying that there are no active network transmissions and that signals are not in the channel transmission state, multiple network nodes may verify the network simultaneously. Channel sensing is the mechanism by which this is accomplished.
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