300-425 · Question #348
A university has three campus locations and the main data center. Each campus location has a Cisco Catalyst 9800-40 WLC that manages 600 APs. The data center has a Catalyst 9800-40 WLC, which serves…
The correct answer is B. The data center WLC and Campus1 WLC are the high availability SSO pair. Campus 1 APs have. The only way to achieve the requirement for Campus1 to operate with zero downtime is to implement Stateful Switchover (SSO) High Availability. SSO requires two controllers to be paired (Active/Standby). Since only the two existing WLCs are available for this specific pairing…
Question
A university has three campus locations and the main data center. Each campus location has a Cisco Catalyst 9800-40 WLC that manages 600 APs. The data center has a Catalyst 9800-40 WLC, which serves as an N+1 backup for each campus WLC. A consulting engineer must install four additional Catalysts 9800-40 WLCs to serve as the high availability SSO pair for each campus, but only two have been approved due to budget restrictions. The new WLCs must be implemented using these requirements:
- Data center WLC must always be available as N+1 backup to either
campus WLC.
- Campus1 WLC must operate with zero downtime.
- In the event of multiple campus outages, the AP priority order is to
support Campus3, Campus2, and then Campus1.
- Each campus acts as either secondary or tertiary backup to another
campus, with data center WLC always being the primary. What design approach must the consulting engineer take?
Options
- AThe data center WLC and Campus3 WLC are the high availability SSO pair. Campus3 APs have
- BThe data center WLC and Campus1 WLC are the high availability SSO pair. Campus 1 APs have
- CThe data center WLC and Campus3 WLC are the high availability SSO pair. Campus1 APs have
- DThe data center WLC and Campus1 WLC are the high availability SSO pair. Campus3 APs have
How the community answered
(30 responses)- A33% (10)
- B43% (13)
- C13% (4)
- D10% (3)
Explanation
The only way to achieve the requirement for Campus1 to operate with zero downtime is to implement Stateful Switchover (SSO) High Availability. SSO requires two controllers to be paired (Active/Standby). Since only the two existing WLCs are available for this specific pairing (Campus1 WLC and Data Center WLC), they must be configured as the SSO pair. Next, the AP priorities must be configured to dictate which campus's APs take precedence in joining the remaining WLC capacity in an outage. The requirement specifies the failover priority should be Campus3, Campus2, and then Campus1. The AP Priority configuration is inversely proportional to the preference, where 1 is the highest preference and 4 is the lowest. Therefore, the priorities must be set as: - Campus3 APs: Priority 1 (Highest preference, served first) - Campus2 APs: Priority 2 - Campus1 APs: Priority 4 (Lowest preference, as it is already protected by SSO and its APs are expected to stay connected to their local SSO pair).
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