Pass the Huawei HCIE-WLAN H12-351_V1.0 Questions and answers with ExamsMirror

According to the Huawei documents and resources, the VRRP preemption delay is the time that an AC waits before preempting another AC with a lower priority. If the VRRP preemption delay is set to a small value, the following problems may occur after a master/backup switchover:

B. A master/backup switchback is triggered too quickly. If the master AC recovers soon after a switchover, it may preempt the backup AC again and become the master AC.  This may cause frequent switchovers and affect network stability 1 .

C. Backup information is incomplete. If the backup AC takes over services from the master AC too quickly, it may not have received all the data sy nchronized from the master AC through HSB.  This may cause service interruption or data loss 2 .

Therefore, B and C are the correct answers. References:  1 : https://support.huawei.com/enterprise/en /doc/EDOC1100064368/80fc2ebd/example-for-configuring-vrrp-hsb  2 : https://support.huawei.com/enterprise/en/doc/EDOC1100096325/1a753937/vrr p-hsb-configuration

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.

With protocol trace, iMaster NCE-CampusInsight displays protocol-level interaction details at the  AP ,  WAC , and  AC  phases for wireless users.

WPA3 has the following advantages over WPA and WPA2:

Supports WPA3-SAE, which provides more secure authentication and key management than PSK.

Provides a more secure handshake protocol than 802.11i, which can resist offline dictionary attacks and protect forward secrecy.

Enhances the algorithm strength from AES-128 to AES-192 or AES-256.

Supports Suite A cryptography, which provides higher security levels for government or military networks.

 In a multicast solution, there must be reachable unicast routes between multicast sources and receivers, because multicast routing protocols use unicast routing information to build multicast forwarding trees.