Exam 350-401 topic 1 question 914 discussion

mobility tunnel allows the controllers to share information about client devices, facilitating seamless roaming as clients move between access points managed by different controllers. CAPWAP is used primarily for communication between WLCs and their associated access points. It manages the configuration, control, and management of APs. While CAPWAP tunnels do carry data and control traffic between APs and WLCs, they are not specifically used to facilitate intercontroller roaming.

The answer is C. Regardless if the WLCs use CAPWAP (used by 9800s) or EoIP (used by AireOS), the tunnels they create are still referred to as "mobility" tunnels. https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/b_c9800_wireless_controller-aireos_ircm_dg.pdf

Between to WC is CAPWAP according to the Cisco docs

Intersubnet - Mobility Intercontroller -CAPWAP https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html

A Intercontroller Roaming, which occurs when the wireless LAN interfaces of controllers are on the same IP subnet. CAPWAP tunnel Intersubnet Roaming, which occurs when the wireless LAN interfaces of controllers are on different IP subnets. Mobility tunnel

To enable intercontroller roaming, a CAPWAP channel needs to be established between two WLCs.

The key is "inter-controller". Each type is used for a different use case: "mobility" tunnel is used for inter-subnet roaming CAPWAP tunnel for inter-controller roaming. https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html

CAPWAP tunnels are used between AP(s) and WLC(s) Mobility tunnels are used between WLCs to enable Intercontroller Layer 3 Roaming Check figure 3: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/overview.html#:~:text=Figure%203.-,Intercontroller%20Layer%203%20Roaming,-Layer%203%20roaming

I'm voting A because of question 935.

A Layer 3 intercontroller roam involves building an additional CAPWAP tunnel between the client’s initial WLC and the WLC to which it has roamed. The tunnel transmits the data to and from the client just like it is still associated with the original IP subnet and WLC. When a Layer 3 roam happens, the original WLC is called the anchor controller, and the current WLC where the roamed client is reassociated is called the foreign controller. The client is anchored to the original WLC even if it roams to different controllers.

To enable inter-controller roaming (or inter-controller mobility) between two WLAN Controllers (WLCs), a Layer 3 tunnel is typically required. This type of tunnel allows client session information to be securely transferred between the controllers, facilitating seamless handoff of clients as they move between different areas covered by different controllers within the same mobility domain. Ans: A

C is correct

i'm going with C

It is asking for, "TYPE" of tunnel. Not the protocol used. C is the most specific answer to this question - always go exactly what is being asked. https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/213913-building-mobility-tunnels-on-catalyst-98.html

A Layer 3 intercontroller roam involves building an additional CAPWAP tunnel between the client’s initial WLC and the WLC to which it has roamed.

C is correct

"Recall that Cisco controllers use CAPWAP tunnels to connect with lightweight APs. CAP- WAP tunnels are also built between controllers for Layer 3 roaming. The tunnel tethers the client to its original anchor controller (and original IP subnet), regardless of its location or how many controllers it roams through." - OCG On page 551 of the OCG you can also see a clear picture of the tunnel between the 2 WLCs