Currently my ISP provides cable thru their DSL modem (Zyxel) to the wall. I hang an Airport Express of that which supports 802.11n but I also have a 1st generation Time Capsule. On Wednesday I should be getting the 6th generation Airport Extreme. I know this adds dual band to my setup and 802.11ac capability. How can I use either of the above and still have guest access separate 2.4 5 GHZ where I can support 802.11n connections but also 802.11ac?