Huawei H12-351_V1.0 Exam Practice Test Instant Access

Question 1

Which of the following statements are true about the WLAN site survey In different typical scenarios? (Select All that Apply)

AIn a classroom scenario. If the walls are made of reinforced concrete, the signal attenuation Is high. In this case, you are advised to test the attenuation during the site survey. Additionally, pay attention to the locations of ELV rooms in the teaching building.

BIn an office scenario, the load-bearing columns and partitions affect the signal coverage. If an integrated ceiling is used, deploy APs near maintenance entrances. If a metal ceiling is used, mount APs on the ceiling or wall.

CIn a ward-round scenario, high requirements are posed on the coverage field strength, roaming effect, and bandwidth. Determine the interference of medical equipment and the areas where Wi-Fi signals are not allowed.

DIn a stadium scenario, the onsite environment is complex and cabling is difficult. Therefore, confirm with the property management company about ELV rooms and cabling. If the transmission distance is too long, consider deploying more switches. During the survey, focus on the interference between APs and AP mounting modes.

Answer : A, B, C, D

Only: All statements are true about the WLAN site survey in different typical scenarios.

Question 2

After multicast-to-unicast conversion is enabled on an AP's air interface, which of the followings is the destination MAC address of multicast packets sent over the air interface?

AMulticast MAC address

BMAC address of the multicast source

CBroadcast MAC address

DMAC address of a STA

Answer : D

After multicast-to-unicast conversion is enabled on an AP's air interface, the destination MAC address of multicast packets sent over the air interface is changed to the MAC address of a STA that has joined the multicast group. This improves the transmission efficiency and reliability of multicast packets.

Question 3

In a multicast solution, there must be reachable unlcast routes between multicast sources and receivers.

ATrue

BFalse

Answer : A

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.

Question 4

As shown in the figure, STA_1 through STA_4 are associated with AP_1, and STA_5 is associated with AP_2. Assuming that the load balancing threshold is 2, the load difference threshold is 25%, and API and AP2 support a maximum of 10 STAs, which of the following statements are true? (Select All that Apply)

AThe load percentage of AP_1 is 40%, and that of AP_2 is 10%.

BThe load balancing mechanism needs to be enabled. Then some STAs are steered from AP_1 to AP__2.

CIf load balancing is performed, the load percentage of AP_1 changes to 30%.

DThe minimum load percentage is 10%, which is greater than the load difference threshold. Therefore, load balancing needs to be enabled.

Answer : A, B

The load percentage of an AP is calculated by dividing the number of associated STAs by the maximum number of STAs supported by the AP. In this case, the load percentage of AP_1 is 4/10 = 40%, and that of AP_2 is 1/10 = 10%. The load balancing mechanism needs to be enabled to balance the load between AP_1 and AP_2. Then some STAs are steered from AP_1 to AP_2 based on the load balancing threshold and the load difference threshold.

Question 5

An AP may preferentially use the BTM mode to steer some STAs. With which of the following protocols are such STAs compliant?

A802.11k

B802.11i

C802.11r

D802.11v

Answer : D

An AP may preferentially use the BTM mode to steer some STAs that are compliant with 802.11v protocol. BTM stands for BSS Transition Management, which is a feature defined in 802.11v protocol that allows an AP to send a request to a STA to switch to another BSS.

Question 6

The display sync-configuration compare command is executed on the backup WAC in HSB to check wireless configuration synchronization. Based on the command output, which of the following statements are true? (Select All that apply)

AThis command is used to check whether the public configurations on two WACs are consistent after wireless configuration synchronization.

BThe configuration of ssid-profile 2 exists on both the master and backup WACs.

CThe configuration of vap-profile name 3 exists on the master WAC but not on the backup WAC.

DThe configuration of vap-profile name 2 exists on the backup WAC but not on the master WAC.

Answer : A, C

The display sync-configuration compare command is used to check whether the public configurations on two WACs are consistent after wireless configuration synchronization. The command output shows the differences between the configurations on the master and backup WACs. In this case, the configuration of vap-profile name 3 exists on the master WAC but not on the backup WAC.

Question 7

In a VRRP HSB scenario, if the VRRP preemption delay is set to a small value, which of the following problems may occur after a master/backup switchover? (Select All that apply)

AThe batch backup process cannot be started.

BA master/backup switchback is triggered too quickly.

CBackup information is incomplete.

DService data on the master and backup WACs is lost.

Answer : B, C

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 stability1.

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 loss2.

Therefore, B and C are the correct answers. Reference:1: https://support.huawei.com/enterprise/en/doc/EDOC1100064368/80fc2ebd/example-for-configuring-vrrp-hsb2: https://support.huawei.com/enterprise/en/doc/EDOC1100096325/1a753937/vrrp-hsb-configuration

Huawei H12-351_V1.0 HCIE-WLAN (Written) V1.0 Exam Practice Test