No worries, neither did I learn these in my education days, its only after you buy or are about to buy certain things that you make researches, the same happened for me and probably happens for everyone else, or otherwise every other physics / electronics grad will come out as audiophile straight from their grad school and every computer grad will understand that dedicated CDPs give a better bitperfect output than a computer CD Rom drive (at least I never understood until I embarked upon HT research)
What I was trying to say is that, until recent times the WRT610N with high gain antennas was my primary router which was connected in its WAN port to a cheap TP-Link 740 router which hosted the connection to internet (from local PARA cable). So the WRT610N was a child under TP Link connected via wired and both had their own LAN segments which could be operated independently.
So when I did not need range, I used the TP-Link Wifi alone and only when I needed range I used to additionally switch on the 610N. This ran fine for almost 2+ years until now when for the last couple of months 610N was showing wifi connection issues (its already aged 4 years +).
So I bought another WRT54GL router, renowned primarily for its stability over long duration usage and wanted to use it just replacing my 610N. But after I purchased it, I was surprised to see that it does not have DHCP reservation capability which was must for some of my LAN devices like NAS, Raspberry Pi with RuneAudio running as audio player to properly work although there were some workarounds none of which were acceptible to me including flashing the stable Linux firware of the 54GL with DD-WRT custom firmware. So I swapped the 54GL in place of the 610N and disabled wifi on the 610N to still use it in place of the TP Link 740 to host the connection to the internet. Because the WRT610N had a very feature rich DD-WRT firmware, I am using it as DHCP server and 54GL 's DHCP server is not in use.
Let me know if you need any additional info.