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Per the IEEE 802.11 handbook SE (the official study guide for CWNE):

?¡é?€??The WEP-40 and WEP-104 values can be used only as group key ciphers. They are never allowed as pairwise ciphers by IEEE 802.11i. Using WEP-40 or WEP-104 as group key cipher indicates that the WLAN is a TSN.?¡é?€??

"A TSN (Transition security network) is a WLAN using both WEP as well as the authentication and key management protocols and cipher suites defined by IEEE 802.11i."

"TSNs provide a method to use legacy equipment that is capable only of WEP encyrption and to use equipment that provides RSN capabilities in a mixed environment."

Basically, the only difference between a TSN and RSN is WEP.

Note: A TSN still advertises RSN capabilities in an RSN information element in its Beacon and Probe Response frames.