Use one cable for two network connections with an Ethernet Splitter. Forward or repeat traffic and connect multiple computers with a Network Switch or Hub.
The Best Ethernet Splitters
Ethernet Splitter vs. Switch: What's the Difference?
8 5 ports desktop gigabit ethernet
Mini 2 Port Rj45 Lan Hub Network Switch Box Computer Ethernet Internet Adapter Rj45 Splitter Switch
2.5G Uplink Ethernet Splitter,2.5Gb Uplink Port&4×1000Mbps Ethernet Port,Home Multi-Gigabit Network Hub Switch,Unmanaged Plug&Play,Metal Case,Desktop/Wall-Mount
Ethernet splitter vs. ethernet switch
networking - Difference between Ethernet splitter and switch - Super User
RJ45 Ethernet Splitter High Speed 1 to 4 Out, 1000Mbps Internet Switch for Cat 5/5e/6/7/8, LAN Network Splitter Ethernet Hub 4 Port Gigabit Support 4 Devices Share The Internet at The Same Time
Ethernet hubs versus switches