D-Link DSL-3900 User Manual page 46

Section 4 - Configuration
WEP-64Bit or WEP-128Bit
Use of WEP encryption is not recommended. Unless your clients do not
support WPA encryption, it is recommended that you select WPA2 or WPA/
WPA2 Mixed instead of WEP as.
Security: WEP-64Bit or WEP-128Bit.
Auth Type: Select either Open or Shared.
Disabling encryption and leaving your wireless network open is not
recommended. Any wireless client will be able to access your network, be able
to use your Internet connection, and leaves you open to security threats.
Security: None. If you select None, no further wireless security configuration
options are available.
D-Link DSL-3900 User Manual
Advanced Settings (continued)
None
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