Questions about D-Link Dgs-108

No, but you can pair more devices together (device is a network switch).

I can only answer the question with reservations because I only see one of the two products in the shop. If the name has no suffix, then the only difference is probably the price. Such differences can presumably be explained by different delivery routes. This can sometimes be recognised by a country abbreviation (e.g. EU / CH).

Yes, it will work and it is a good product.

Hello, I strongly assume that the switch is not defective. Think more about cables or disabled Gb on the mainboard. A simple test method would be to take the router that has a 1Gb connection and can also test all ports on the switch individually with one and the same cable. This means plugging the cable from the router into each port individually without any other devices. Make sure that the green LED always starts to light up immediately. The maximum waiting time for carrying out the action should be less than 2 seconds on each port. If you expect it to take longer on a single port, it may well be that it is down.

Ca. 110 cm.