Ethernet or USB Connection?

Does the Hub connect to a computer equally well with either the ethernet or the USB port? My single ethernet port is used by my broadband modem. Is there an inexpensive accessory that will split the ethernet port and provide two simultaneously-working ports? Will a router be necessary to do this?

Just use a router to connect both your computer and your hub to the internet and to each other. There is no such accessory and you can’t use the usb to connect you computer to the hub.