Logically the Vice President will replace the president when he is unable to serve the country for some reason and the same in networking the secondary will take over the primary when the primary is down. This is matter of common sense to have a secondary for backup purposes
A: A secondary, or tertiary controller does not allow roaming functionality by default. They MUST be in the same mobility group for this functionality.
B: Yes
C: A secondary, or tertiary controller does not load-share registration of LAPs by default. They MUST be in the same mobility group for this functionality.
D: No; neither secondary/tertiary, nor mobility grouped controllers have this functionality. While mobility grouped controllers can share LAP registration and context-state information (including client-state) the actual traffic itself is NOT load-balanced (shared) across controllers within the mobility group.
Much of this question relies on your understanding of the benefits, limitations, and differences between Mobility Groups, and Primary/Secondary/Tertiary controllers.
A LAP can be configured to have a secondary/tertiary controller for backup registration purposes; where none of the controllers are in the same mobility groups, if in mobility groups at all. The reverse is true; where controllers that are all in the same mobility group can be assigned as primary, secondary, and tertiary on an LAP.. of which, enables roaming seamlessly, and several other benefits.
When the primary controller (WLC-1) goes down, the APs automatically get registered with the secondary
controller (WLC-2). The APs register back to the primary controller when the primary controller comes
back on line.
Reference: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/69639-wlcfailover.html
The question is very tricky here. It does not say when the primary WLC fails, but it says while the primary WLC operates. so the role of secondary WLC while the primary functions is to enable L2. L3 roaming btw itself and the primary WLC.
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