@Ami14
WiFi is transmitted from the Hub: for broadband to arrive into the Hub (so that the WiFi has some content) it needs whichever of those cables is relevant.
If you could put the address into that link and look at the first line of text under the table, that would indicate which cable you require.
* * * * * * *
Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
