350-401 Question #463: Real Exam Question with Answer & Explanation

Question

How is Layer 3 roaming accomplished in a unified wireless deployment?

Options

• AAn EoIP tunnel is created between the client and the anchor controller to provide seamless
• BThe client entry on the original controller is passed to the database on the new controller.
• CThe new controller assigns an IP address from the new subnet to the client
• DThe client database on the original controller is updated the anchor entry, and the new controller

Explanation

Layer 3 Roaming in Unified Wireless Deployments

Option D is correct because in a Layer 3 roam (where the client moves between controllers in different subnets), the original (foreign) controller updates its client database to mark the new controller as the "anchor," while the new controller tunnels client traffic back to the original controller - allowing the client to retain its original IP address and maintain seamless connectivity.

Why the distractors are wrong:

• Option A is partially misleading because while an EoIP tunnel is involved, it runs between the foreign and anchor controllers, not between the client and the anchor controller directly - the client is unaware of this tunneling mechanism.
• Option B describes a Layer 2 roam, where the client simply moves between access points within the same subnet and the session information is passed to the new controller without needing a tunnel.
• Option C is incorrect because assigning a new IP address would break existing sessions - the entire purpose of Layer 3 roaming is to allow the client to keep its original IP address even when moving to a new subnet.

💡 Memory Tip: Think of Layer 3 roaming as "stay home while you travel" - the client keeps its home (original) IP address, and the foreign controller acts as a relay, always sending traffic back to the anchor (home) controller.

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