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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter       Configuring the Wireless Device
Configuring Wireless Settings
Security Types
Table 1 describes the four security types that you can assign to an SSID.
Ta b l e 1 Ty p e s  o f  S S I D  S e c u ri t y
Security Type Description Security Features Enabled
No Security This is the least secure option. You should use this option 
only for SSIDs used in a public space and assign it to a 
VLAN that restricts access to your network.
None.
Static WEP Key This option is more secure than no security. However, 
static WEP keys are vulnerable to attack. If you 
configure this setting, you should consider limiting 
association to the wireless device based on MAC 
address. See Cipher Suites and WEP at Cisco.com for 
configuration procedures, 
http://www.cisco.com/en/US/docs/routers/access/
wireless/software/guide/SecurityCipherSuitesWEP.html
.
Or
If your network does not have a RADIUS server, 
consider using an access point as a local authentication 
server.
See Using the Access Point as a Local Authenticator at 
Cisco.com for instructions, 
http://www.cisco.com/en/US/docs/routers/access/
wireless/software/guide/SecurityLocalAuthent.html.
Mandatory WEP. Client devices 
cannot associate using this SSID 
without a WEP key that matches the 
wireless device key.