ZyXEL Communications G-302, User Manual

Page: 29 / 71

ZyXEL G-302 v3 User’s Guide
Chapter 2 Wireless LAN Network 29
Figure 11 WPA(2) with RADIUS Application Example
2.3 Authentication Type
The IEEE 802.11b/g standard describes a simple authentication method between the wireless
stations and AP. Two authentication types are defined: an
Open system mode and a Shared
key mode.
• Open system mode is implemented for ease-of-use and when security is not an issue.
The wireless station and the AP or peer computer do not share a secret key. Thus the
wireless stations can associate with any AP or peer computer and listen to any transmitted
data that is not unencrypted.
• Shared key mode involves a shared secret key to authenticate the wireless station to the
AP or peer computer. This requires you to enable the wireless LAN security and use same
settings on both the wireless station and the AP or peer computer.
2.4 Preamble Type
Preamble is used to signal that data is coming to the receiver.
Short preamble increases performance as less time sending preamble means more time for
sending data. All IEEE 802.11b/g compliant wireless adapters support long preamble, but not
all support short preamble.
Select Auto to have the G-302 v3 automatically use short preamble when access point/
wireless stations support it, otherwise the G-302 v3 uses long preamble.
Note: The G-302 v3 and the access point/wireless stations MUST use the same
preamble mode in order to communicate.