Exam 300-425 topic 1 question 165 discussion

Actual exam question from Cisco's 300-425

Question #: 165
Topic #: 1

A customer has a centralized wireless deployment with N+1 high availability and few open authentication SSIDs configured. After failover, all APs are broadcasting all SSIDs, but the clients are assigned IP addresses from a different subnet. The WLANs on both WLCs are configured with the same dynamic interfaces. Which feature must be incorporated in the wireless design of the second controller?

A. RF Profile
B. AP Groups
C. VLAN Select
D. AAA Override

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Suggested Answer: C 🗳️

by Bandito at Feb. 9, 2024, 6:04 a.m.

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Abbribas

1 month ago

Selected Answer: C

In that N+1 / HA scenario, when all APs fail over onto the standby WLC they still advertise the SSIDs, but without any per-AP VLAN mapping the clients all wind up on whatever the standby’s “native” dynamic‐interface VLAN is. By enabling VLAN Select on the secondary controller you get per-AP VLAN tagging (based on the AP’s trunk port VLAN) instead of the blanket dynamic‐interface VLAN, so after failover each AP still tags clients into the correct local subnet. So the missing piece in your HA-N+1 design is: C. VLAN Select

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Bandito

10 months, 2 weeks ago

Correct When a client roams from one controller to another, the foreign controller sends the VLAN information as part of the mobility announce message. Based on the VLAN information received, the anchor decides whether the tunnel should be created between the anchor controller and the foreign controller. If the same VLAN is available on the foreign controller, the client context is completely deleted from the anchor and the foreign controller becomes the new anchor controller for the client. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-2/config-guide/b_cg82/b_cg82_chapter_010101101.pdf

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