ZyXEL P-2812HNU-51c User Manual download pdf (Page 173)

Chapter 7 Wireless LAN

P-2812HNU-51c User’s Guide

173

7.11.2 Additional Wireless Terms

The following table describes some wireless network terms and acronyms used in

the P-2812HNU-51c’s Web Configurator.

7.11.3 Wireless Security Overview

The following sections introduce different types of wireless security you can set up

in the wireless network.

7.11.3.1 SSID

Normally, the P-2812HNU-51c acts like a beacon and regularly broadcasts the

SSID in the area. You can hide the SSID instead, in which case the P-2812HNU-

51c does not broadcast the SSID. In addition, you should change the default SSID

to something that is difficult to guess.

This type of security is fairly weak, however, because there are ways for

unauthorized wireless devices to get the SSID. In addition, unauthorized wireless

devices can still see the information that is sent in the wireless network.

7.11.3.2 MAC Address Filter

Every device that can use a wireless network has a unique identification number,

called a MAC address.

A MAC address is usually written using twelve hexadecimal

Table 48 Additional Wireless Terms

TERM DESCRIPTION

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

P-2812HNU-51c. 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 P-2812HNU-51c.

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 P-2812HNU-51c does, it cannot

communicate with the P-2812HNU-51c.

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.

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