Exam H12-821_V1.0-ENU Topic 2 Question 403 Discussion

Actual exam question for Huawei's H12-821_V1.0-ENU exam
Question #: 403
Topic #: 2

In WLAN networking, backup technologies can be deployed to ensure the reliability of the networking.
Which of the following statements about backup technology is correct? (Multiple choice)

A. After deploying VRP hot backup, when the active AC fails, STA can forward data directly through the standby AC B. After N+1 backup is deployed, when the active AC fails, the AP needs to go online to the standby AC again, and the STA will interrupt the service C. After deploying dual-link hot backup, when the active AC fails, the AP can quickly switch to the standby AC, and the STA does not need to disconnect and reconnect D. After deploying dual-link cold backup, when the active AC fails, the AP only needs to wait for a period of time before switching to the standby AC, which will not affect the STA business

Comments

david.mwita28

2026-03-09 16:26:54

Selected Answer: ABC

C is also correct because;
In dual‑link hot backup:

The AP maintains two simultaneous CAPWAP tunnels (active + standby).
The standby AC keeps synchronized STA and AP state.
If the active AC fails, AP immediately switches to the backup tunnel.

→ STAs remain online with no reauthentication or reassociation.
This is a characteristic advantage of dual‑link hot backup.

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