C is false because HTTPS redirection is not required for Portal authentication to work properly.

References: https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/troubleshooting-portal-authentication-failures

C is not a tool commonly used for WLAN network planning, acceptance, or health evaluation. eDesk is a tool for remote fault diagnosis and rectification on WLAN networks.

References: https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/wlan-planner https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/imaster-nce-campusinsight https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/cloudcampus-app

MP: Mesh node that uses IEEE 802.11 MAC and PHY protocols for wireless communication. This node supports automatic topology discovery, automatic route discovery, and data packet forwarding.  It can provide both mesh service and user access service 1 .

MPP: MP node that connects a WMN to MPs on other types of networks.  This node can function as a portal for communication between internal mesh nodes and external networks 1 .

Neighbor MP: Neighboring MP with which an MP prepares to establish a mesh link 1 .

Candidate MP: AP that directly communicates with a mesh node 2 .

https://support.huawei.com/enterprise/en/doc/EDOC1100064365/90f2391e/configuration-examples-for-mesh  2 : https://support.huawei.com/enterprise/en/doc/EDOC1100169459/8d79210e/configuring-wireless-mesh-networking

Attack defense is a feature that allows APs to analyze the contents and behaviors of incoming packets on ports to determine whether packets have attack characteristics. The APs then take defense measures on the packets that have attack characteristics, such as discarding them or limiting their rate. Attack defense can defend against spoofing packet attacks, malformed packet attacks, fragmentation attacks, and flood attacks.

References: https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/attack-defense

C is false because the license file only affects the number of devices that can be managed by iMaster NCE-CampusInsight, not the data display.

E is false because the UTC time of devices does not need to be consistent with that of iMaster NCE-CampusInsight.

References: https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/data-display

According to the Huawei documents and resources, the definitions of the short-range wireless IoT technologies are as follows:

ZigBee: IEEE 802.15.4-based wireless communication technology is a short-range, and low-power wireless communication technology that supports star, mesh, and hybrid networking.

Bluetooth: With the emergence of IoT industries such as smart wearables, smart home, and Internet of Vehicles, short-range communication technologies are attracting more and more developers.

REID: Its basic principle is to automatically identify objects based on the transmission characteristics of radio signals and space coupling (inductance or electromagnetic coupling) or radar reflection.

Wi-Fi: Wireless networking technology based on IEEE 802.11 is the most popular WLAN technology.

Therefore, ZigBee - 1, Bluetooth - 3, REID - 2, Wi-Fi - 4 is the correct answer. References: : https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/zigbee : https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/bluetooth : https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/rfid : https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/wi-fi

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 synchronized 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/vrrp-hsb-configuration

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.

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