What are the consequences of network collisions?

Question

Computer networks

Tell me, what happens if the same addresses appear in a network built on non-managed switches?
It is clear that a collision occurs after machines with the same addresses start sending in response to received packets.
Is it possible that with two identical addresses the entire network falls, and why does this happen?
And is it possible that the parallel network is also falling, let's say raised by the second addresses on the devices?

Answer 1

"Addresses" in networks are different
IP - addresses
MAC - addresses
The consequences of their coincidence are also different.
If the IP matches, there will be a dull glucodrome in the form of duplication of pings, higher-level protocols like TCP will fall off.
If the MAC matches, there will be similar nonsense.
Where in 2016 you will find a dumb-headed hub is the main question.
The worst thing that can happen in such a network is a loop. Then the network will be clogged with clones of one package and become a stake.

Answer 2

The whole network usually does not fall, it’s just that only one of the devices will randomly work with the network at any given time, since the switches will route packets to IP by MAC address and from time to time will choose another MAC (port), the specific picture depends on the logic of the operation of specific switches and the ratio of network activity of devices with the same IP.
Worst of all will be if someone "takes over" the default gateway IP. In this case, from time to time, the Internet will either work for everyone, or not.