Free Access Cisco.350-401.v2024-10-10.q537 Practice Test (Page 17)

Question 76

Drag and drop the characteristics from the left to the correct Infrastructure deployment type on the right.

Question 77

Which statement about multicast RPs is true?

A.RPs are required only when using protocol independent multicast dense mode.

B.RPs are required for protocol independent multicast sparse mode and dense mode.

C.By default, the RP is needed periodically to maintain sessions with sources and receivers

D.By default, the RP is needed only to start new sessions with sources and receivers.

Question 78

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

A.An EoIP tunnel is created between the client and the anchor controller to provide seamless connectivity as the client is associated with the new AP.

B.The client entry on the original controller is passed to the database on the new controller.

C.The new controller assigns an IP address from the new subnet to the client

D.The client database on the original controller is updated the anchor entry, and the new controller database is updated with the foreign entry.

Correct Answer: D

An EoIP tunnel is created between the anchor and foreign controller, not between the client and the anchor controller -> Answer A is not correct.
In instances where the client roams between APs that are connected to different WLCs and the WLC WLAN is connected to a different subnet, a Layer 3 roam is performed, and there is an update between the new WLC (foreign WLC) and the old WLC (anchor WLC) mobility databases.

The client begins with a connection to AP B on WLC 1. This creates an ANCHOR entry in the WLC client database (-> Answer D is correct as the client database is marked "ANCHOR"). As the client moves away from AP B and makes an association with AP C, WLC 2 sends a mobility announcement to peers in the mobility group looking for the WLC with the client MAC address.
WLC 1 responds to the announcement, handshakes, and ACKs. Next the client database entry for the roaming client is copied to WLC 2, and marked as FOREIGN. Included PMK data (master key data from the RADIUS server) is also copied to WLC 2. This provides fast roam times for WPA2/802.11i clients because there is no need to re-authenticate to the RADIUS server.
After a simple key exchange between the client and AP, the client is added to the WLC 2 database and is similar, except that it is marked as FOREIGN.
Reference:
https://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob30dg/TechArch.html and
https://mrncciew.com/2013/03/17/l3-inter-controller-roaming/
In Layer 3 roaming, no IP address refresh needed (although client must be re-authenticated and new security session established) -> Answer C is not correct.
In summary, the "Mobility State" of a client is described below:
+ Before roaming: Mobility State = Local
+ After roaming: Mobility State on Old Database = Anchor; Mobility State on New Database = Foreign Therefore the client entry on the original controller is not passed to the database totally. The client entry is still on the old controller but it is marked "Anchor" -> Answer B is not correct.