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Exam 300-425 topic 1 question 93 discussion

Actual exam question from Cisco's 300-425
Question #: 93
Topic #: 1
[All 300-425 Questions]


Refer to the exhibit. A client roams between two APs that are registered to two different controllers, where each controller has an interface in the client subnet.
Both controllers are running AireOS. Which scenario explains the client roaming behavior?

  • A. Controllers exchange mobility control messages (over UDP port 16666), and the client database entry is moved from the original controller to the new controller.
  • B. Controllers do not exchange mobility control messages (over UDP port 16666), and the client database entry is not moved from the original controller to the new controller.
  • C. Controllers exchange mobility control messages (over UDP port 16666), and a new client session is started with the new controller.
  • D. Controllers exchange mobility control messages (over UDP port 16666), and the client database entry is tunneled from the original controller to the new controller.
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Suggested Answer: A 🗳️
by Cyrillka at May 13, 2021, 1:17 p.m.

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Liselot
Highly Voted 3 years, 4 months ago
It's a layer 2 (same subnet) inter-controller roam. The client database entry is moved to the new controller. --> Answer A is correct
upvoted 10 times
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Cyrillka
Highly Voted 3 years, 12 months ago
A is correct https://mrncciew.com/2013/03/16/wireless-mobility-basics/
upvoted 6 times
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Farhad123
Most Recent 6 months, 3 weeks ago
A is correct
upvoted 1 times
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Goatgirl20
3 years, 9 months ago
Answer should be D When the client associates to an access point joined to a new controller, the new controller exchanges mobility messages with the original controller, and the client database entry is moved to the new controller. New security context and associations are established if necessary, and the client database entry is updated for the new access point. This process remains transparent to the user. https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-3/configuration/guide/b_cg73/b_wlc-cg_chapter_01111.html
upvoted 1 times
edgardm0426
1 year ago
This is wrong
upvoted 1 times
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Hamoze
3 years, 9 months ago
I think you mean A , client database is entry is moved to the new controller
upvoted 6 times
Johnconnor2021
3 years, 5 months ago
No, D is correct, look carefully: there is a CAPWAP involved. According to the Cisco Press book there is a Inter-controller Layer 3 Roam. So when there is a IC L3 involved a CAPWAP tunneled is formed in order to exchange the user information from one WLC to other WLC, hence D is correct.
upvoted 1 times
Johnconnor2021
3 years, 5 months ago
I quote from Chapter 8. of the ENWLSD book: (...) "Layer 3 roams require a further step, where anchor and foreign controllers must form a relationship and the extra CAPWAP TUNNEL REQUIRED TO TRANSPORT the client’s traffic between them.(...)"
upvoted 1 times
Johnconnor2021
3 years, 5 months ago
I read again and my bad: A is the correct answer, both WLC are in the SAME subnet, hence no tunnel is added at least the WLC are in different subnets. A is correct. Sorry for the confusion
upvoted 10 times
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