ZyXEL N4100 Guia Do Utilizador

 Chapter 25 Wireless LAN

N4100 User’s Guide

• Every device in the same wireless network must use security compatible with 

the AP.
Security stops unauthorized devices from using the wireless network. It can also 

protect the information that is sent in the wireless network.

The following table describes some wireless network terms and acronyms used in 
the N4100’s Web Configurator.

The following sections introduce different types of wireless security you can set up 
in the wireless network.

Normally, the N4100 acts like a beacon and regularly broadcasts the SSID in the 
area. You can hide the SSID instead, in which case the N4100 does not broadcast 
the SSID. In addition, you should change the default SSID to something that is 
difficult to guess.

Table 49   Additional Wireless Terms

RTS/CTS Threshold

In a wireless network which covers a large area, wireless devices 
are sometimes not aware of each other’s presence.  This may cause 
them to send information to the AP at the same time and result in 
information colliding and not getting through.

By setting this value lower than the default value, the wireless 
devices must sometimes get permission to send information to the 
N4100. The lower the value, the more often the devices must get 
permission.

If this value is greater than the fragmentation threshold value (see 
below), then wireless devices never have to get permission to send 
information to the N4100.

Preamble

A preamble affects the timing in your wireless network. There are 
two preamble modes: long and short.

 

If a device uses a different 

preamble mode than the N4100 does, it cannot communicate with 
the N4100.

Authentication

The process of verifying whether a wireless device is allowed to use 
the wireless network.

Fragmentation 
Threshold

A small fragmentation threshold is recommended for busy networks, 
while a larger threshold provides faster performance if the network 
is not very busy.