350-401 Question 173
Single answerA large enterprise network has deployed multiple wireless LAN controllers (WLCs) in different locations. Users are experiencing connectivity issues when moving between access points (APs) that are managed by different WLCs. Which Layer 2 or Layer 3 roaming solution would best address these issues while maintaining seamless connectivity?
- A
Layer 2 roaming with a single mobility group across WLCs
- B
Layer 3 roaming with Mobility Anchors configured
- C
Layer 2 roaming between WLCs without a mobility group
- D
Layer 3 roaming using a VLAN-based tunneling solution
Show answer and explanation
Correct answer: B
Explanation
Layer 3 roaming with Mobility Anchors is the most appropriate solution for seamless user connectivity when moving between access points managed by different WLCs and residing in different subnets. This feature enables user traffic to be tunneled back to a designated anchor WLC, maintaining the same IP address and eliminating session interruptions. Other options are either technically incorrect or do not address the issue of roaming across different Layer 3 subnets.
- A. Incorrect.
Layer 2 roaming with a single mobility group across WLCs only works if the same VLANs and IP subnets are extended across the WLCs. It does not solve connectivity issues when users move between different IP subnets.
- B. Correct.
Layer 3 roaming with Mobility Anchors allows seamless user roaming between WLCs with different subnets by tunneling user traffic back to the anchor WLC. This solution effectively addresses the described issue.
- C. Incorrect.
Layer 2 roaming between WLCs without a mobility group is not supported and would result in the loss of user sessions during the roaming process.
- D. Incorrect.
Layer 3 roaming using a VLAN-based tunneling solution is not a standard Cisco wireless roaming feature, making it an incorrect option in the context of this scenario.