How can i setup a wireless LAN that can serve up to 20,000 concurrent devices. I am having a problem in figuring out if i need one router or several routers. A topology diagram with explanation would be very very much appreciated. Thanks in advance.

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    You’re talking about a serious commercial undertaking that would support a small city. It’s amazing that you would expect to get free useful advice on a project this size from strangers on the Internet. There are so many variables to consider, that this question is impossible to give a useful answer.
    – Ron Trunk
    Aug 9 '20 at 15:45

Depending on the usage profiles, you can support between 10 (serious) and 100 (very light) users per WAP. Since that means 200 to 2000 access points, you'll likely want a managed, controller-based solution with central RADIUS authentication.

The WAPs need to be uplinked by a sufficiently fast switch fabric, again depending on the expected overall load.

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