ZyXEL nbg-4615 사용자 가이드

Chapter 14 Wireless LAN

NBG4615 User’s Guide

Unauthorized devices can still see the information that is sent in the wireless 
network, even if they cannot use the wireless network. Furthermore, there are 
ways for unauthorized wireless users to get a valid user name and password. 
Then, they can use that user name and password to use the wireless network.

Local user databases also have an additional limitation that is explained in the 
next section.

Wireless networks can use encryption to protect the information that is sent in the 
wireless network. Encryption is like a secret code. If you do not know the secret 
code, you cannot understand the message.

The types of encryption you can choose depend on the type of user 
authentication. (See 

 for information about this.)

For example, if the wireless network has a RADIUS server, you can choose WPA 
or WPA2. If users do not log in to the wireless network, you can choose no 
encryption, Static WEP, WPA-PSK, or WPA2-PSK.

Usually, you should set up the strongest encryption that every wireless client in 
the wireless network supports. For example, suppose the AP does not have a local 
user database, and you do not have a RADIUS server. Therefore, there is no user 
authentication. Suppose the wireless network has two wireless clients. Device A 
only supports WEP, and device B supports WEP and WPA. Therefore, you should 
set up Static WEP in the wireless network.

Note: It is recommended that wireless networks use WPA-PSK, WPA, or stronger 

encryption. IEEE 802.1x and WEP encryption are better than none at all, but it 
is still possible for unauthorized devices to figure out the original information 
pretty quickly.

Note: It is not possible to use WPA-PSK, WPA or stronger encryption with a local user 

database. In this case, it is better to set up stronger encryption with no 
authentication than to set up weaker encryption with the local user database.

When you select WPA2 or WPA2-PSK in your NBG4615, you can also select an 
option (WPA Compatible) to support WPA as well. In this case, if some wireless 
clients support WPA and some support WPA2, you should set up WPA2-PSK or 

Table 41   Types of Encryption for Each Type of Authentication

No Security

WPA

Static WEP
WPA-PSK

WPA2-PSK

WPA2