How to take advantage of 802.11ac wi-fi with AirPort Extreme?

Greetings. I will be purchasing a new iMac that will support 802.11ac wi-fi and would like to take advantage of this by using the Apple AirPort Extreme but I'm not sure how. I currently have a modem (Cisco DPC3825) from my internet provider, which does not support 802.11ac. If I were to connect the AirPort Extreme to my modem (DPC3825) via an Ethernet cable and then (wirelessly) connect my new iMac to the netowrk, would I receive 802.11ac or just b/g/n still? In addition, when I connect the AirPort Extreme to my modem, will it create two networks (i.e. one network for the AirPort Extremem + my original wifi network) or can you merge it into one network? Hopefully what I'm asking makes sense. Thank you.

If I were to connect the AirPort Extreme to my modem (DPC3825) via an Ethernet cable and then (wirelessly) connect my new iMac to the netowrk, would I receive 802.11ac or just b/g/n still?
802.11ac would be received by the iMac if it connected to the AirPort Extreme wireless signal....and....the iMac was in close proximity to the AirPort Extreme.
802.11ac uses the 5 GHz frequency, and these signals only work well then the router and computer are in the same room or have a line-of-sight relationship  to each other, or very close to that ideal.
In addition, when I connect the AirPort Extreme to my modem, will it create two networks
The AirPort Extreme will create a network with two bands or frequencies.....one  2.4 GHz for "b", "g" and "n" wireless devices and another band, the 5 GHz signal for "n" and "ac" devices.
If you assign the same name to  the AirPort Extreme network that you use for your existing network, and both routers are using the same wireless security settings and password, then everything will act like one "big" network.
If you assign a different name to the AirPort Extreme wireless network, then you will have two different networks....one produced by your existing router and the other produced by the AirPort Extreme.
If you move from one area to another, you will have to log off of one network and log back onto the other network.

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