The description or specifications should include that use of additional ethernet ports require a business account with your internet provider. I purchased this model for that reason and was disappointed that wasn't included.
I upgraded my my modem and router thinking my equipment was just too old so aside from that, I bought the nighthawk modem to replace my D-link modem and what a huge difference..my internet speed is 200meg dl and this modem gives me that. Super easy to setup, just plug and play after calling your provider to get it programmed. It is a little big compared to old D-link which isn’t a big deal to me.