ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 92)

Chapter 7 Wireless LAN

NBG420N User’s Guide

When you select WPA2 or WPA2-PSK in your NBG420N, 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 WPA2 (depending on the

type of wireless network login) and select the WPA Compatible option in the NBG420N.

Many types of encryption use a key to protect the information in the wireless network. The

longer the key, the stronger the encryption. Every wireless client in the wireless network must

have the same key.

7.3 Roaming

A wireless station is a device with an IEEE 802.11a/b/g/n compliant wireless interface. An

access point (AP) acts as a bridge between the wireless and wired networks. An AP creates its

own wireless coverage area. A wireless station can associate with a particular access point

only if it is within the access point’s coverage area.

In a network environment with multiple access points, wireless stations are able to switch from

one access point to another as they move between the coverage areas. This is known as

roaming. As the wireless station moves from place to place, it is responsible for choosing the

most appropriate access point depending on the signal strength, network utilization or other

factors.

The roaming feature on the access points allows the access points to relay information about

the wireless stations to each other. When a wireless station moves from a coverage area to

another, it scans and uses the channel of a new access point, which then informs the other

access points on the LAN about the change. An example is shown in Figure 60 on page 93.

With roaming, a wireless LAN mobile user enjoys a continuous connection to the wired

network through an access point while moving around the wireless LAN.

Enable roaming to exchange the latest bridge information of all wireless stations between APs

when a wireless station moves between coverage areas. Wireless stations can still associate

with other APs even if you disable roaming. Enabling roaming ensures correct traffic

forwarding (bridge tables are updated) and maximum AP efficiency. The AP deletes records of

wireless stations that associate with other APs (Non-ZyXEL APs may not be able to perform

this). 802.1x authentication information is not exchanged (at the time of writing).

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ZyXEL NBG420N Manuel d'utilisateur Page 92