We have a new site that was wired by the contractors with ethernet & Fiber.
# 1. The ethernet connects the clients to the switches in the wiring closets "5 closets".
# 2. The fiber connects the wiring closets back to to the main server room.
# 3. Also there will be connections to the main switch in the server room with ethernet "Server / Hubs" etc.....
So a break down....
Connects clients "Ethernet"
Connects back bone "Fiber"
Connects back bone "Fiber 6 seperate connections"
Connects hubs / servers "Ethernet"