This is a switch/hub. Basic: makes one port on your router into 5 ports for additional wired devices.

This is just a switch to add more devices. It does not need SSID or Password as it is a wired device and not associated with WiFi. Just plug it in to your router and plug your devices in to it.

Practically nothing. #gs605na looks shinier and can be mounted to a wall. I purchased #gs605na to connect a few wired devices in my office and it works perfectly.

As far as I can tell by a very quick internet search the first one is a five port device and the second one is an eight port device.

I have two of these devices in use: one in a stand-alone network and one connected to my wireless router. The router connection automatically crossed over using a straight-through cable.

Yes, it will auto detect and allow you to connect as many switches as you've got open ports.

China like many devices manufacturing cost savings