QUESTION: 5

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)

The batch backup process cannot be started.
A master/backup switchback is triggered too quickly.
Backup information is incomplete.
Service data on the master and backup WACs is lost.

Answer(s): B,C

Explanation:

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:

https://support.huawei.com/enterprise/en/doc/EDOC1100064368/80fc2ebd/example-for-
configuring-vrrp-hsb
https://support.huawei.com/enterprise/en/doc/EDOC1100096325/1a753937/vrrp-hsb-configuration

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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)

This command is used to check whether the public configurations on two WACs are consistent after wireless configuration synchronization.
The configuration of ssid-profile 2 exists on both the master and backup WACs.
The configuration of vap-profile name 3 exists on the master WAC but not on the backup WA
The configuration of vap-profile name 2 exists on the backup WAC but not on the master WAC.

Answer(s): A,C

Explanation:

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.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/display- sync-configuration-compare

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QUESTION: 7

In a dual-link backup scenario, the active/standby link switchover mode is set to priority.
When the active link recovers, the AP detects that the original active link has a higher priority and triggers a switchback. How many Echo intervals does the AP wait for before switching back to the original primary WAC?

Answer(s): C

Explanation:

In a dual-link backup scenario, when the active link recovers, the AP waits for 15 Echo intervals before switching back to the original primary WAC. This prevents frequent link switchovers caused by unstable links.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/dual-link- backup

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QUESTION: 8

In a dual-link HSB scenario, after an AP sets up CAPWAP links with the active and standby WACs, which of the following types of packets does the AP periodically send to the WACs to detect link status?

DTLS
Join
Echo
Keepalive

Answer(s): C

Explanation:

In a dual-link HSB scenario, after an AP sets up CAPWAP links with the active and standby WACs, the AP periodically sends Echo packets to the WACs to detect link status. The Echo packets are sent every 30 seconds by default.

Reference:

https://support.huawei.com/enterprise/en/doc/EDOC1100058940/8a8f1c9b/dual-link- hsb

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