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A device with literal two ports is called a coupler. To be a switch it would have to have at least 3 ports, otherwise there is no point putting in the hardware for switching packets.

 

4 ports was common for hubs but is less common for switches. 5 ports is the smallest common switch size.

Looking to buy GTX690, other multi-GPU cards, or single-slot graphics cards: 

 

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there are nothing to be switched if only two ports...

 

i think you need some kind of repeater? or just connecting two LAN cables? or connecting two PC?

 

For repeater just buy a normal switch.

Connecting lan cable just buy rj45 coupler

connecting two pc just connect it.

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There are devices which take advantage of the fact that you only need 4 out of the 8 wires in an ethernet cable to have a working 100 mbps connection.

So such device has one input jack and splits the 8 wires from the cable to two separate ethernet jacks, each with 4 wires connected inside.

 

So basically, you're supposed to plug one part of the device in two ports of a switch or router, the two ports on the switch are automatically configured to 100 mbps because the switch/router detects only 4 wires in the jacks, and then the device combines the two jacks into a single ethernet cable. Then, on the other end of the ethernet cable, you use the other part of this device which takes in the cable and creates two 100 mbps jacks and you can plug a computer and a phone, for example.. both running at 100 mbps.

 

There's no network switch or hub that would have one input jack and only two network jacks as outputs, it makes no sense financially. The cheapest integrated chips with everything but the kitchen sink built in are designed to have one "input" and four "outputs" (a 5 port switch/router) and slightly more expensive devices have one input and 7 outputs (a total of 8 ethernet ports)

 

With network switches, there's no special "input" only ports or "outputs", the switch simply takes data from one port and passes it to one of the other ports on the switch without caring what is behind each port.

 

 

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