Question : MAC Address Table Size

I´d like to know the relation between the number of active points inside a LAN and the minimum size of mac addresses that a switch inside such LAN must support.

E. g., if a LAN has 100 access points what´s the minimum size of the mac address table of their switches?

Answer : MAC Address Table Size

The customer is always right.

He may have specified a minimum MAC table size as a way to weed out "toy" devices, figuring the class of device he wants will have no trouble meeting this level.

You *might* score some points with him if you demonstrate that you know what you're doing by asking to confirm that spec.  From the information available, it doesn't sound like he will actually need anything like that much.  Perhaps there's some additional information that he hasn't provided....

A switch will provide best performance if its table is big enough to hold information about every active MAC address in the all of the VLANs/broadcast domains present on the switch (even if the actual devices are attached to some other switch).  It will work -- with some risk of a slight performance hit -- if the table is smaller than that.  12K should be enough for 200 devices, and more will not, in and of itself, provide any direct benefit.