In the early 1990s, the switch market opened in Hongmeng and the world was chaotic.
Not only are manufacturers fighting in disorder, but even the protocol and standard of the switch are still uncertain. Token ring, FDDI and ATM technologies, which only appear in the textbooks of the new generation of network engineering, lead each other and attack each other.
Ethernet, as the protocol with the earliest birth but the slowest “development”, survives in the cracks, and there is no sign of later domination