300-425 · Question #315
In WLAN high availability, which deployment provides two controllers that share AP load and fail over instantly?
The correct answer is B. Active/Active SSO (Stateful Switchover). Active/Active SSO pairs two controllers that simultaneously serve APs and synchronize client state, enabling instant failover with no client reassociation.
Question
In WLAN high availability, which deployment provides two controllers that share AP load and fail over instantly?
Options
- AN+1 redundancy
- BActive/Active SSO (Stateful Switchover)
- CSingle-controller centralized model
- DCloud-only deployment
How the community answered
(34 responses)- A3% (1)
- B91% (31)
- D6% (2)
Why each option
Active/Active SSO pairs two controllers that simultaneously serve APs and synchronize client state, enabling instant failover with no client reassociation.
N+1 redundancy keeps one controller in standby and does not share the AP load during normal operation, so it does not meet the load-sharing requirement.
In Active/Active Stateful Switchover (SSO), both controllers are live simultaneously and share the AP and client load between them. Client session state is continuously synchronized between peers, so if one controller fails, the surviving controller takes over all APs instantly without requiring clients to re-authenticate or reassociate. This design provides both load distribution and seamless high availability in a single deployment model.
A single-controller centralized model has no redundancy partner and represents a single point of failure for the wireless network.
Cloud-only deployment describes a management plane architecture, not a specific hardware HA or failover mechanism.
Concept tested: Active/Active SSO wireless controller high availability
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/high-availability.html
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