Selecting the "Network-EAP" option in "Accept Authentication Type" will enable LEAP authentication
Selecting (a)Open in "Accept Authentication Type." and (b) "Require EAP"(only under open authentication) will enable EAP-TLS authentication (also enables EAP MD5):
If you want to enable both do the following:
i. Check Open in "Accept Authentication Type."
ii. Check "Require EAP" (only under open authentication).
iii. Select the "Network-EAP" option.
If you do this, the access point is configured to allow only LEAP and EAP-TLS/MD5 clients to authenticate to the enterprise wireless LAN network.
Some documents useful can be found at:
http://www.cisco.com/warp/public/cc/pd/sqsw/sq/tech/acstl_wp.htm