Nerd here. You confuse me:

WAN is some up-/downstream port connecting intranets remotely in my novice book. The measurement G doesn't refer to some advertisement-thingy in terms of wireless speed (but Gigabyte) - Maybe it's some form of Generation; But then I lack everything including my false base knowledge. Additionally I have never encountered "2.5G LAN" ever before: Would you be able to shed light on my shortcomings? 2.5 x 8 is 20 Gbit. I didn't read about that size yet.

Edit: Thanks guys!