Exam 350-401 topic 1 question 842 discussion

When a client initiates an L3 intercontroller roam, the two controllers involved can compare the VLAN numbers that are assigned to their respective WLAN interfaces If the two VLAN IDs differ, the controllers arrange a Layer 3 roam (also known as a local-to-foreign roam) that will allow the client to keep using its IP address. D: wrong -> talks about management VLAN of the controller

WLC layer 3 roaming: 1. Maintain original IP address 2. Avoid DHCP reassignment 3. Establish a roaming tunnel 4. Works with different VLAN assignments 5. Stay connected across multiple controllers

A is correct

ANs: A - Layer 3 roaming is similar to Layer 2 roaming in that the controllers exchange mobility messages on the client roam. However, instead of moving the client database entry to the new controller, the original controller marks the client with an “Anchor” entry in its own client database. The database entry is copied to the new controller client database and marked with a “Foreign” entry in the new controller. The roam remains transparent to the wireless client, and the client maintains its original IP address. ref: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/overview.html

With a twinkle in their eye and a dash of magic in the air, the controllers concocted a plan. Instead of letting the client lose its IP address like a lost sock in the dryer, they decided to arrange a Layer 3 roam, also known as a local-to-foreign roam. This special journey would allow the client to keep using its IP address as it roamed from Controller A's kingdom to Controller B's domain.

Layer 3 roaming occurs when the wireless LAN interfaces of the controllers are on different IP subnets. The roam remains transparent to the wireless client, and the client maintains its original IP address. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/overview.html

Correct A

L3 roaming enables client to preserve its ip when roaming to an AP that is connected to another WLC https://study-ccnp.com/wlan-intercontroller-layer-2-layer-3-roaming/