Exam 200-301 topic 1 question 334 discussion

I probably did... but i do not remember seeing this in the ccna course at all 802.11v Basic Service Set (BSS) transition management - BSS transition management with Disassociation Imminent allows the network’s control layer to influence client roaming behavior by providing it the load information of nearby access points. The device takes this information into account when deciding among the possible roam targets. Directed Multicast Service (DMS) - DMS optimizes multicast traffic transmission on wireless networks. The device uses this information to enhance multicast communication and preserve device battery life. BSS Max Idle Service - The BSS Max Idle Service helps clients and access points efficiently decide how long to remain associated when no traffic is being transmitted. The device uses this information to preserve device battery life. Disassociation Imminent - The Disassociation Imminent option sets a flag in 11v request telling the client that it needs to roam, or it will be disassociated after a certain amount of time. https://support.accessagility.com/hc/802.11k-802.11r-and-802.11v

D. 802.11k neighbor List Dual Band "With the neighbor list information, the 11k capable client does not need to probe all of the 2.4 GHz and 5 GHz channels to find an APit can roam to. Not having to probe all of the channels reduces channel utilization on all channels, thereby increasing bandwidth on all channels. It also reduces roam time and improves the decisions made by the client." https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/5700/software/release/ios_xe_33/11rkw_DeploymentGuide/b_802point11rkw_deployment_guide_cisco_ios_xe_release33/b_802point11rkw_deployment_guide_cisco_ios_xe_release33_chapter_010.pdf

802.11k roaming

B is correct

Yet another question not covered in the OCG or any of the courses. The answer is D. 802.11k is the relevant standard. The neighbor "List Dual Band" option optimizes AP selection on clients by creating pre-cached version of possible AP's to roam to in both the 2.4 and 5 GHz bands. See the docs here https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/client_roaming.html

Disassociation Imminent Within a BSS transition Management Request, Disassociation Imminent field can be added. This function is to disassociate the client after a period of time if the client does not re-associate to another AP. When unsolicited optimized roaming request is triggered, the AP sends a BSS Transition Management Request to the client and wait for a certain period (time configured under Optimized Roaming Disassociation Timer), if the client does not roam to a better AP within that period of time, then the AP completes the disassociation of the client. When Unsolicited Load Balance request is triggered, the AP sends a BSS Transition Management Request to the client and wait for a certain period (time configured under Disassociation Timer), if the client does not roam to a less congested AP within that period of time, then the AP completes the disassociation of the client. Example of a BSS transition management frame with Disassociation imminent enabled:

Disassociation Imminent Within a BSS transition Management Request, Disassociation Imminent field can be added. This function is to disassociate the client after a period of time if the client does not re-associate to another AP. When unsolicited optimized roaming request is triggered, the AP sends a BSS Transition Management Request to the client and wait for a certain period (time configured under Optimized Roaming Disassociation Timer), if the client does not roam to a better AP within that period of time, then the AP completes the disassociation of the client. When Unsolicited Load Balance request is triggered, the AP sends a BSS Transition Management Request to the client and wait for a certain period (time configured under Disassociation Timer), if the client does not roam to a less congested AP within that period of time, then the AP completes the disassociation of the client. Example of a BSS transition management frame with Disassociation imminent enabled:

Chatgpt says: While option D (802.11k Neighbor List Dual Band) is related to improving network efficiency and assisting devices in making better decisions during roaming, it may not directly address the requirement of minimizing association time for mobile devices as they move around the office. The 802.11k Neighbor List Dual Band feature provides information about neighboring access points, including details about their capabilities and signal strength. This information helps devices make informed decisions about when to roam and which access point to associate with. While it can contribute to better roaming decisions, it doesn't focus exclusively on minimizing the association time itself. Given the specific requirement to minimize association time, the more relevant option would be: A. 802.11v BSS Max Idle Service This feature aims to improve mobility by providing information to devices about nearby access points and their capabilities, helping devices make quicker and more efficient decisions when roaming.

802.11v BSS Max Idle Service is a feature that allows clients and access points to efficiently decide how long to remain associated when no traffic is being transmitted. This helps to preserve battery life on mobile devices. 802.11v Disassociation Imminent is a feature that allows access points to notify clients when they are about to be disassociated. This gives clients a chance to save any data that they have not yet transmitted. 802.11ax BSS configure is a feature that allows access points to be configured to support 802.11ax clients. This is not necessary for the project objective, as the project objective is to minimize the association time to the different access points as mobile devices move around the office. 802.11k neighbor List Dual Band is a feature that allows access points to maintain a list of neighboring access points on both the 2.4 GHz and 5 GHz bands. This is not necessary for the project objective, as the project objective is to minimize the association time to the different access points as mobile devices move around the office.

Enabling the ".11v Disassociation Imminent" setting alone does not automatically roam, it just signals the client that roaming is required, but does not provide information on the APs. To perform automatic roaming, it is activated together with the ".11v BSS Transition" option activated, which enables the Optimized Roaming resource, being able to send information about the APs, by "Disassociation Imminent" message. While we can directly enable ".11k Neighbor List Dual Band" which already provides customers with a list of neighbors from the same WLAN and roaming can be enabled automatically.

I feel a little disheartened... I'm searching on CCNA Official Cert Guide PDF but none of these names are reported. So. Why there is this question in the exam?

As far as I understand, Disassociation Imminent option doesn't help users at all to move around. Within a BSS Transition Management Request, the Disassociation Imminent field can be added. This function is to disassociate the client after a period of time if the client does not re-associate with another AP. However, as we want to have the roaming option for different types of devices which are of course limited to some frequencies and channels, I go with option D.

802.11k: Radio optimization 802.11r: Roaming optimization 802.11v:Management

11k neighbor lists come from the distribution system and are a range of potential roaming targets for the client. Instead of performing the normal off-channel scanning and full sweep, the client can immediately reach out on known channels for association. Of all the answers, 11k is the most helpful in fast roaming operations if the client can handle it.