Exam 350-401 topic 1 question 47 discussion

Answer is B: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html

Has to be B as it is almost like word by word in line with Cisco's definition as below . "SDA supports two additional types of roaming, which are Intra-xTR and Inter-xTR. In SDA, xTR stands for an access-switch that is a fabric edge node. It serves both as an ingress tunnel router as well as an egress tunnel router. When a client on a fabric enabled WLAN, roams from an access point to another access point on the same access-switch, it is called Intra-xTR. Here, the local client database and client history table are updated with the information of the newly associated access point. When a client on a fabric enabled WLAN, roams from an access point to another access point on a different access-switch, it is called Inter-xTR. Here, the map server is also updated with the client location (RLOC) information. Also, the local client database is updated with the information of the newly associated access point."

In this case, since the user is moving between APs connected to different access switches but staying within the same WLC, the fabric handles the mobility through a seamless Layer 2 handoff without requiring inter-xTR communication. The new fabric edge node updates the control plane (map server) with the client's new location, and traffic forwarding is adjusted accordingly.

Fast Roaming is often used to refer to intracontroller roaming (i.e., roaming within the same WLC).

The question describes Inter-xTR verbatim.

D is correct

it´s B

going from one AP to another AP on a different access switch in a fabric enabled WLAN is the very definition of inter-xTR.

Answer is B SDA Roaming SDA supports two additional types of roaming, which are Intra-xTR and Inter-xTR. In SDA, xTR stands for an access-switch that is a fabric edge node. It serves both as an ingress tunnel router as well as an egress tunnel router. When a client on a fabric enabled WLAN, roams from an access point to another access point on the same access-switch, it is called Intra-xTR. Here, the local client database and client history table are updated with the information of the newly associated access point. When a client on a fabric enabled WLAN, roams from an access point to another access point on a different access-switch, it is called Inter-xTR. Here, the map server is also updated with the client location (RLOC) information. Also, the local client database is updated with the information of the newly associated access point. https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/16-12/config-guide/b_wl_16_12_cg/mobility.html

correct A is D

Correct answer is B When a client on a fabric enabled WLAN, roams from an access point to another access point on a different access-switch, it is called Inter-xTR. Here, the map server is also updated with the client location (RLOC) information. Also, the local client database is updated with the information of the newly associated access point. https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html

When a client on a fabric enabled WLAN, roams from an access point to another access point on a different access-switch, it is called Inter-xTR

D. Fast Roam Fast Roaming is a technique used to facilitate seamless and quick roaming of wireless clients between different access points without significant interruption. When a user roams from one AP to another on a different access switch but within the same mobility domain controlled by a single WLC, fast roaming mechanisms like Cisco's Fast Secure Roaming (FSR) or 802.11r (Fast BSS Transition) can be utilized to ensure minimal disruption during the handoff process. These methods help maintain connectivity and security while the client moves between APs.

The answer is D. Fast Roam. In a wireless Cisco SD-Access deployment, Fast Roam is the preferred method for seamless roaming between access points on the same fabric. It uses a pre-authentication and pre-association process to allow the client device to establish a connection to the new access point before it physically moves to the new location. This minimizes the amount of time the client device is disconnected from the network. Inter-xTR roaming is used in a Cisco SD-Access deployment where the user is moving between different virtual networks. Auto anchor roaming is used in a multi-WLC deployment where the user is moving between different physical locations. Layer 3 roaming is not used in a wireless Cisco SD-Access deployment. It is a method of roaming that uses Layer 3 routing to move a client device from one access point to another. However, in a Cisco SD-Access deployment, all access points are part of the same fabric and are interconnected using Layer 2. Therefore, there is no need to use Layer 3 routing for roaming.

roaming : inter-xTR = different switch intra-xTR = same switch

B is correct

"When a client on a fabric enabled WLAN, roams from an access point to another access point on a different access-switch, it is called Inter-xTR." https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html