Which feature intersection of a Cisco 5760 Wireless LAN Controller with HA AP SSO is not true?

B.

-> Switchover during AP Pre-Image download causes the APs to start image download all over again from the new Active controller.

-> Rogue APs and clients are not synced to Standby and are re-learnt upon switchover.

-> Infrastructure MFP key is not synced to the Standby controller and is re-learnt upon switchover.

-> New Active controller re-learns the shun list from IPS and other MCs, and redistributes it to the MAs.

-> wIPS information is not synced to the Standby unit and is re-learnt upon switchover.

-> Clean Air detected Interferer devices are re-learnt after switchover.

-> Net Flow records are cleared upon switchover and collection starts fresh on the new Active controller.

-> Mobility paths and tunnels to the MO and other peer MCs are not disrupted upon switchover.

However the Client state is cleaned up on the MO under which the HA pair exists and is re-learnt from the new Active controller when the client re-associates.

-> Roamed clients that have their data path going through the Mobility Tunnel Endpoint (MTE) "become Local" in case of L2 with Sticky Anchoring and L3 Roam.

L2 Roamed Clients are not affected except when roaming occurs between CUWN and CA controllers.

-> RRM related configurations and the AP neighbor list in the Leader HA pair is synced to the Standby controller.

-> Upon Guest Anchor controller switchover, mobility tunnels stay active, APs remain connected, clients rejoin at MA or MC, and are anchored on the new Active controller.

http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/5700/software/release/ios_xe_33/5760_HA_DG_iosXE33.html#pgfId-45754

The correct answer to the question is D. Switchover during AP preimage download causes the APs to start image download all over again from the new active controller.

Explanation: The Cisco 5760 Wireless LAN Controller supports High Availability (HA) AP Stateful SwitchOver (SSO) for uninterrupted wireless services in case of a failure. When the active controller fails, the standby controller takes over the role of the active controller with no disruption to the wireless services.

Option A is a true statement, where upon guest anchor controller switchover, mobility tunnels remain active, APs remain connected, clients rejoin at the mobility agent (MA) or mobility controller (MC), and clients are anchored on the new active controller.

Option B is also a true statement, where the wIPS (Wireless Intrusion Prevention System) information is synced to the standby unit. The standby unit does not have to relearn wIPS information upon switchover.

Option C is also a true statement, where roamed clients that have their data path going through the mobility tunnel endpoint "become Local" in case of Layer 2 with sticky anchoring and Layer 3 roam. Layer 2 roamed clients are not affected except when roaming occurs between Cisco Unified Wireless Network and CA controllers.

Option D is not a true statement, where switchover during AP preimage download causes the APs to start image download all over again from the new active controller. This is because the AP preimage download is not synchronized between the active and standby controllers. As a result, if an AP is downloading an image from the active controller when a switchover occurs, the download process is interrupted, and the AP starts the image download all over again from the new active controller.

In summary, Option D is the correct answer as the feature intersection of a Cisco 5760 Wireless LAN Controller with HA AP SSO that is not true is switchover during AP preimage download causes the APs to start image download all over again from the new active controller.