Wired Ethernet is limited to 100 meters because, in the early days of its development, engineers found that they could successfully send signals over distances up to 100 meters. Today’s 100-meter limit is a limitation of the original specification. The specification was set at a time when it represented the typical distance that copper wire could successfully carry a signal at 10 Mb/s. Since then, advancements have enabled Ethernet to operate at higher speeds over greater distances. Ethernet is typically limited to 100 meters per twisted-pair segment. You can extend this distance using switches as repeaters. You can use fiber if you don’t mind paying significantly more for link distance in exchange for greater bandwidth.