Authentication Methods

1. Open System (No Authentication)
2. Shared Key
3. WPA-Personal
4. WPA2-Personal
5. WPA-Auto-Personal
6. WPA-Enterprise (For Company's)
7. WPA2-Enterprise (For Company's)
8. WPA-Auto-Enterprise (For Company's)
9. Radius with 802.1x (For Company's)

As of 2012 WPA2-Personal is the best. All home routers should be set to this. A Shared Pass Phrase must be set on the router and supplied by each client. Encryption uses AES CCMP (Not TKIP as in WPA).

If and ONLY if you have some old device that won't connect then you should use WPA-Auto-Personal. WPA can only use wireless G Speeds. Some recommend setting up a separate WAP to support older clients.