ZyXEL ZyAIR G-570S User Manual download pdf (Page 145)

ZyXEL G-570S User’s Guide

Appendix C Wireless LANs 145

WEP Authentication Steps

Three different methods can be used to authenticate wireless stations to the network: Open

System, Shared Key, and Auto. The following figure illustrates the steps involved.

Figure 108 WEP Authentication Steps

Open system authentication involves an unencrypted two-message procedure. A wireless

station sends an open system authentication request to the AP, which will then automatically

accept and connect the wireless station to the network. In effect, open system is not

authentication at all as any station can gain access to the network.

Shared key authentication involves a four-message procedure. A wireless station sends a

shared key authentication request to the AP, which will then reply with a challenge text

message. The wireless station must then use the AP’s default WEP key to encrypt the

challenge text and return it to the AP, which attempts to decrypt the message using the AP’s

default WEP key. If the decrypted message matches the challenge text, the wireless station is

authenticated.

When your device authentication method is set to open system, it will only accept open system

authentication requests. The same is true for shared key authentication. However, when it is

set to auto authentication, the device will accept either type of authentication request and the

device will fall back to use open authentication if the shared key does not match.

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ZyXEL ZyAIR G-570S User Manual Page 145