networking - Will an Ethernet splitter work? - Super User

I have a room with only one Ethernet cable going there, but I would like to connect two devices on it. Is an Ethernet splitter suitable for that? I am talking about something like this: In theory it

How Does An Ethernet Splitter Work

RJ45 Ethernet Splitter 1 to 2: This RJ45 Ethernet Splitter can split one network cable into two outputs, which can be connected to TVs, computers, routers, etc. Two devices can be connected to the Internet at the same time. (Note: Does not support IPTV signal divided into two TVs to watch at the same time.) Equipped with a USB charging cable, CAN NOT be used without connection it.

Ethernet Splitter High Speed 1 to 2, RJ45 1000Mbps Ethernet Splitter with USB Power Cable, Internet Splitter Either Network for Cat7/Cat6/Cat5e/Cat5

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RJ45 Ethernet Cable Splitter Network Adapter,Ethernet Splitter 1 to 3 Cable Suitable Super LAN Ethernet Connector Adapter cat 6

Ethernet Splitter 1 to 2 RJ45 Extender [2 Devices Simultaneous Networking], Network Switch Converter with 1.2m USB Power Cable, Suitable for CAT