Does turning off wireless feature inactivate the firewall?

My goal is to insert a hardware firewall between my modem and PPC Mac computer, and accordingly, plan to use the Apple Airport Extreme (AE) base station router for this purpose.  Since I don't really need the wireless feature at this time, I plan to turn off Wi-fi on AE.  Will doing so also turn off or diminish the WPA/WPA2 & WEP security firewall features of AE, or will they still work as expected with my wired internet connection?

Wireless security is not really referred to as a "firewall" in the strict sense of the word. Wireless security, or encryption, is used on your "local" network to prevent unauthorized computers from connecting to your local network.
A firewall is special software that protects all devices on your local network from devices on the Internet.  The AirPort Extreme uses a very effective NAT firewall.
If you have the AirPort Extreme connected to a simple modem, the NAT firewall is automatically enabled.

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