QUESTION: 9

Which of the followings is not a roaming optimization solution?

Proactive roaming
Smart roaming
Fast roaming using PMK caching
802.11r roaming

Answer(s): B

Explanation:

Smart roaming is not a roaming optimization solution, but a feature that allows an AP to automatically adjust its transmit power based on signal strength and interference level. The other options are all roaming optimization solutions that can reduce roaming latency and packet loss.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/smart- roaming

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QUESTION: 10

DRAG DROP (Drag and Drop is not supported)
802. 11r fast roaming (over-the-air) is enabled on the WLAN shown in the figure. A STA roams from AP1 to AP2. Sort the steps in chronological order during the 802.11r fast roaming process between WACs.

See Explanation section for answer.

Answer(s): A

Explanation:

According to the Huawei documents and resources, the chronological order during the 802.11r fast roaming process between WACs is as follows:

2.The STA accesses the network through API. This is the initial association process before roaming. 1.The STA initiates an 802.11 FT authentication request to AP2. This is the first step of the roaming process when the STA moves to a new AP.
3.AP2 starts the reassociation timer, and sends an 802.11 FT authentication response to the ST A. This is the second step of the roaming process when AP2 responds to the STA's request and sets a timer for reassociation.
4.The STA generates and installs a P TK based on the information contained in the response frame. This is the third step of the roaming process when the STA derives a new pairwise key for encryption.
5.The STA sends a reassociation request to AP2. This is the fourth step of the roaming process when the STA requests to reassociate with AP2.
6.AP2 generates and installs a PTK according to PMK-RI and information contained in the request frame. This is the fifth step of the roaming process when AP2 derives the same pairwise key as the STA.
7.After receiving the reassociation request, AP2 disables the reassociation timer, and then sends a reassociation reg onse to the STA. This is the sixth step of the roaming process when AP2 confirms the reassociation with the STA and stops the timer.
8.The STA receives the response frame of AP2. The roaming process is complete. This is the final step of the roaming process when the STA completes the handover to AP2. Therefore, 2, 1, 3, 4, 5, 6, 7, 8 is the correct answer.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100169459/8d79210e/configuring-wireless- mesh-networking

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QUESTION: 11

In Huawei's smart roaming solution, which of the following methods can be used by a WAC to discover and maintain neighboring AP entries of STAs? (Select All that Apply)

The WAC obtains such entries using 802. 11v.
The AP listens to the Probe frames sent by STAs.
The AP periodically and proactively scans neighboring APs of STAs.
STAs proactively report neighboring AP information.

Answer(s): B,C

Explanation:

In Huawei's smart roaming solution, the WAC can discover and maintain neighboring AP entries of STAs by using two methods: passive listening and active scanning. Passive listening means that the AP listens to the Probe frames sent by STAs and reports them to the WAC. Active scanning means that the AP periodically and proactively scans neighboring APs of STAs and reports them to the WAC.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/smart- roaming

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QUESTION: 12

Which of the following statements about the home agent are true? (Select All that Apply)

The home agent communicates with the gateway on the STAs1 home network at Layer 2.
The home agent communicates with the gateway on the STAs' home network at Layer 3.
A home AP can function as a home agent of STAs.
A home WAC can function as a home agent of STAs.

Answer(s): B,D

Explanation:

The home agent is a device that communicates with the gateway on the STAs' home network at Layer 3 and maintains the binding entries of STAs' home addresses and care-of addresses. A home WAC can function as a home agent of STAs, while a home AP cannot.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/mobile-ip

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