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WS 2000 Wireless Switch System Reference Guide9-28
She clicks the Ok button in the 802.1x-EAP configuration window. She then clicks the WPA-TKIP Settings button in the
security screen.
TKIP encryption protocol calls for keys between two specific nodes to change with every packet. However, there is no
standard with respect to how often one should change keys for broadcast packets. A very busy network with lots of
broadcast packets could generate enough packets for successful decryption in about an hour. Clarisa sets the system to
rotate the broadcast keys every five minutes.
TKIP requires an initial shared key to start, so that all messages can be encrypted, including the first one. This initial key
setting would be entered in the lower half of this screen, if it were needed. However, if 802.1x EAP user authentication is
enabled, the authentication server will provide the initial key to the client and the key settings will be grayed out. In this
case, Clarisa is using 802.1x EAP user authentication, so she does not have it enter an initial shared key.