|ADSL uses a phone line.|
RJ-45 = standard network jack
RJ-11 = standard phone jack
If a router is a combination unit (ie: combination modem/router/wireless access point) then it will have an RJ-11 jack for the "internet" connection.
If your router is just a router and you have a separate modem, then the modem will have an RJ-11 jack for the "internet" connection and an RJ-45 jack for the "LAN" connection which you would connect to the "WAN" (internet, external....however it's labelled" jack on the router.
Cable uses a coaxial cable.
If your cable router is a combination unit, it will have the coaxial type connector for the "internet". If your router is just a router, you'll have a separate modem and as above for the ADSL, the router will have an RJ-45 for the "internet" connection and the modem will have a coaxial connector for it's "internet" connection.
Most, but not all routers have 4 LAN ports. Some only have one.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.