Exam 350-401 topic 1 question 1004 discussion

maybe D is right because , from cisco 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. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/overview.html

Client stays anchored to the original controller so the client database entry does not move. It is copied.

Correct answer is D. Database entry is not moved because tunnel is estabished to original controller.

Mobility Tunneling: The new WLC (foreign controller) establishes a tunnel to the original WLC (anchor controller) where the client was first associated. This tunnel allows the client to retain its original IP address. The original WLC (anchor controller) keeps the client's database entry, including its session information, security context, and original IP address. The foreign controller creates a new client entry in its database for the client but marks it as a "foreign" entry.

the correct answer is C. Once the association between the anchor and the foreign controller is established, the foreign controller is in charge of forwarding the client's data. That's the reason why the right answer can't be D

D is the correct answer because the key here is the work "Layer 3 Roam" in a layer 3 roam the client connect remains with it's original controller so that it maintains it's original Layer 3 IP Address and thus it would be marked an Anchor on the original controller.

Layer 2 Roaming: The client database entry can be moved to the new controller as the client remains within the same Layer 2 domain. Layer 3 Roaming: The client database entry does not move to the new controller; instead, the new controller tunnels the client traffic back to the original controller to maintain the original IP address.

"The database entry is COPIED to the new controller" and "The database entry is MOVED to the new controller" is not the same!!! That is why answer C is not correct.

D is correct.

I believe there is an emphasis on word "during" A - happens when roaming is not enable B - wrong since it marked as Anchor on original controller (happens during roam) C - correct and happens during Layer 3 roaming D - answer itself says "after a layer 3 roam occurs" - "during" requirement not met

In a Layer 3 roam, the client moves to a different subnet and thus a different controller. The new controller takes over managing the client, and the client database entry is updated and transferred from the old controller to the new one. This ensures that client sessions and context are maintained even as the client moves between different network segments.

100% d

The correct answer is D

Answer is D based on the definition of a layer 3 roam from the official cert guide: "A Layer 3 intercontroller roam consists of an extra tunnel that is built between the client’s original controller and the controller it has roamed to. The tunnel carries data to and from the client as if it is still associated with the original controller and IP subnet. Figure 19-9 shows the results of a Layer 3 roam. The original controller (WLC 1) is called the anchor controller, and the controller with the roamed client is called the foreign controller. Think of the client being anchored to the original controller no matter where it roams later. When the client roams away from its anchor, it moves into foreign territory."

It is a tricky question, in choice C the word "moved" is wrong it should be "copied" because after the client roaming from AP1 to AP2; the database entry in this case copied from WLC1 to WLC2 (All WLC share the same database entry), NOT moved, MOVED meaning is the database of WLC1 became clear. so C is incorrect. The correct answer is D.

after reading this, im going with D https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/overview.html#:~:text=Layer%203%20roaming%20is%20similar,in%20its%20own%20client%20database.

C is correct