What technology does a Cisco WLC use to provide Layer 3 roaming to a wireless client?
- an IPsec tunnel to connect the client to the original AP
- a CAPWAP tunnel that tethers the client to the original anchor controller
- a GRE tunnel to relay the data between the original AP and the roamed AP
- a NAT translation to match the IP address in the roamed AP to the original AP
| Explanation & Hint:
A Layer 3 intercontroller roam consists of an extra CAPWAP tunnel that is built between the original controller with which the client associated (called the anchor controller) and the controller it has roamed to (called the foreign controller). The tunnel carries data to and from the client as if it is still associated with the original controller and IP subnet. |