In a segmented WLAN with a different IP address for each segment, which solution allows mobile clients to maintain connectivity when roaming into different segments?

In a segmented WLAN with a different IP address for each segment, which solution allows mobile clients to maintain connectivity when roaming into different segments?

• A. Use separate VLANs for each AP with unique subnets.
• B. Deploy APs with multiple subnets and frequent DHCP reassignment.
• C. Upgrade encryption to WPA3.
• D. Deploy all APs on a single VLAN with a flat IP subnet and route traffic through a central controller.

Answer: (D)

Maintaining connectivity as a mobile client roams between access points requires keeping the client on the same Layer 2 network so its IP address doesn’t change and sessions aren’t dropped. In a WLAN where each segment uses a different IP subnet, moving from one segment to another would normally force a new IP and disrupt ongoing traffic. Placing all APs on a single VLAN with a flat IP subnet keeps the client on one broadcast/domain while a central controller handles the roaming. The controller manages the handoff and routes traffic through a single control point, preserving the client’s IP address and session state as it moves between APs. The other approaches would reintroduce IP changes during roam or don’t address mobility at all: separating VLANs per AP isolates segments so roaming would break continuity; using multiple subnets with DHCP reassignment forces new IPs; upgrading encryption improves security but doesn’t solve mobility or IP continuity.

Maintaining connectivity as a mobile client roams between access points requires keeping the client on the same Layer 2 network so its IP address doesn’t change and sessions aren’t dropped. In a WLAN where each segment uses a different IP subnet, moving from one segment to another would normally force a new IP and disrupt ongoing traffic. Placing all APs on a single VLAN with a flat IP subnet keeps the client on one broadcast/domain while a central controller handles the roaming. The controller manages the handoff and routes traffic through a single control point, preserving the client’s IP address and session state as it moves between APs.

The other approaches would reintroduce IP changes during roam or don’t address mobility at all: separating VLANs per AP isolates segments so roaming would break continuity; using multiple subnets with DHCP reassignment forces new IPs; upgrading encryption improves security but doesn’t solve mobility or IP continuity.