Not enough Ethernet ports

Airport Extreme only provides three Ethernet LAN ports, which is not enough. Is it possible to daisychain an Airport Extreme to another Airport Extreme? If so, how?
Thanks.

I assume that an Ethernet "hub" is the same thing as an Ethernet "switch"? 
No, that is not the case. A hub splits up or divides the available bandwidth among connected devices. So, if you have 4 devices connected, each device would receive 1/4 of the available bandwidth.
A switch delivers full bandwidth to each connected device.....much better performance. For that reason, a switch was traditionally quite a bit more expensive that a hub. Luckily, that is not the case any longer. For a $10-15 dollar premium, you can get a Gigabit Ethernet switch, instead of a hub.
am I also correct that in order to get Gigabit Ethernet from the Extreme and/or the hub (or switch), I will first have to be sure that my modem isoutputting via Gigabit Ethernet?
I doubt that you can find a Gigiabit Ethernet modem. Even if you could, your signal is only going to be as "fast" as the plan that your provider will allow.  Typically, that might be 20 Mbps.......while Gigabit is 1,000 Mbps.
The advantage to having Gigabit speeds on your "local" or "private" network is that file transfers or copies between devices will occur much more quickly.
Your Internet connection will never be any faster than your plan allows.

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