Cisco Cisco Aironet 1240 AG Access Point 설치 가이드

There are four security types you can assign to an SSID:

No security—The least secure option. Use this option only for SSIDs 
used in a public space, and assign it to a VLAN that restricts access to 
your network.

Static WEP Key—More secure than no security. Static WEP keys are 
vulnerable to attack. There are two different lengths for WEP keys: 
40-bit and 128-bit (hexadecimal or ASCII characters). Cisco access 
points use hexadecimal characters. Client adapters can use either, 
depending on how the vendor chooses to configure them.

EAP Authentication—Enables 802.1x authentication. Requires an IP 
address and shared secret from an authentication server on your network 
(server authentication port 1645). You do not need to enter a WEP key.

WPA—Wi-Fi Protected Access (WPA) permits wireless access to users 
authenticated against a database through the services of an 
authentication server and encrypts their IP traffic with stronger 
algorithms than those used in WEP. As with EAP authentication, you 
must enter the IP address and shared secret for an authentication server 
on your network (server authentication port 1645).