Switching in networks - what about the data transfer rate?

Question

Computer networks

Good afternoon comrades.
I hope for your help!
Imagine 3 switches, with number 1 at the top and with numbers 2 and 3 at the bottom, connected to number 1. Switches are connected to the first with only one patch cord, speed 100mb / sec. Suppose two clients are connected to number 2 and 3, with number 1 and 2 to switch 2, 3 and 4 to switch 3. What will happen if client 1 and 2 start simultaneously transmitting data to clients 3 and 4, a 100 megabit band will share theoretically in half, i.e. 50 each or not?

Answer 1

No. The switch will forward at port speed (-5-7%) traffic from both clients. When the shelf reaches 100Mb, the excess will be discarded. You will see in the counters of switches (if they are managed) most likely drops. On what basis will they be rejected? In the case of a conventional unmanaged switch, the frame that arrived earlier will leave earlier. Those who come later will be rejected. This applies to both the transmitting port and the receiving port.

Answer 2

Yes. Although in reality it is unlikely to be evenly distributed. Rather, there will be something from the area of ​​\u200b\u200b5 and 95 or 20 and 80.