How do you check to see if the firewall is up?

Hi,
I need to disable my router's firewall but I don' want to expose the office computers to any untold risks. All the computer's are connected to the internet either wirelessly thanks to the Airport Extreme, or via a wired connection (modem/router —> Airport Extreme —> Ethernet Switch —> computer) with the Airport acting as one of the nodes.
As I understand it, the network will be safe from harm if I can ensure the firewall is up in my Airport Extreme.
How can I tell that it's up? There's no mention of a firewall in the Airport Utility.
Help is much appreciated.

Thanks for the tip but I can't find the Network tab. I entered the Airport Utility and clicked on Manual and the only tabs on view are 'Summary', 'Basestation', 'Wireless', and 'Access'. Not to sound ungrateful or anything (I'm always grateful for any support I receive) but could you be more precise with your instructions?

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