350-401 · Question #1135
350-401 Question #1135: Real Exam Question with Answer & Explanation
The correct answer is C: mobility. Mobility tunnels are specifically created between Wireless LAN Controllers (WLCs) to facilitate intercontroller roaming, allowing client sessions and state information to be seamlessly transferred between controllers when a client moves between access points managed by different
Question
Which type of tunnel is required between two WLCs to enable intercontroller roaming?
Options
- ACAPWAP
- BLWAPP
- Cmobility
- DIPsec
Explanation
Mobility tunnels are specifically created between Wireless LAN Controllers (WLCs) to facilitate intercontroller roaming, allowing client sessions and state information to be seamlessly transferred between controllers when a client moves between access points managed by different WLCs.
Why the distractors are wrong:
- A (CAPWAP): CAPWAP tunnels operate between access points and their WLC - they carry control and data traffic in the AP-to-controller relationship, not between two controllers.
- B (LWAPP): LWAPP is the older predecessor protocol to CAPWAP and similarly describes AP-to-controller communication, not controller-to-controller communication.
- D (IPsec): While IPsec can encrypt mobility tunnels in certain deployments, it is not the type of tunnel required - it is an optional security overlay.
Memory Tip: Think of it this way - when clients move (roam), they need a mobility tunnel. The word "mobility" directly maps to the concept of movement between controllers, making it easy to associate with roaming scenarios. If the question involves AP ↔ WLC, think CAPWAP; if it involves WLC ↔ WLC, think mobility.
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