Will adding switch extend my ethernet cable?
Solution 1:
The length restriction is related to collision detection.
As each switch port is a collision domain, you can use a switch to extend the distance and get more than 100m.
Just like this :
A ------------------------Switch ----------------------------B
100m 100m
You can continue extending the distance using another switch from B to another destination and so on, however it is recommended no extending more than 7 switches (7 hops).
The 7 hops limitation is related to the Spanning Tree Protocol. This protocol is designed to control and prevent the creation of closed loops in a switching network.
In a case where you will need to use 7 or more switches, then it's better to put some fiber optic from initial source to final destination and use only one switch.