In the L2 network of WLAN, which of the following statements about the application of option43 is correct? (Multiple choice)

Question

Options

• AThe command to configure the IP addresses of the active AC and the standby AC in the option43 parameter field of the DHCP server is option43 sub-option 2 ip-address ip-address <1-8>
• BIf the AC provides IP addresses advertised by option 43 does not respond to the AP, the AP will immediately fail to discover the AC
• CAfter configuring the option 43 field, the AP will only send unicast Discovery Request messages to the AC IP address advertised by option 43
• DTo configure the option 43 field, you need to notify the AP of the IP addresses of its active AC and standby AC, and also need to notify the IP addresses of other active AC

• A
  83% (29)
• B
  11% (4)
• C
  3% (1)
• D
  3% (1)

Explanation

Option A is correct because on Huawei WLAN equipment, option43 sub-option 2 ip-address is the proper command syntax to populate the vendor-specific DHCP field with the active and standby AC IP addresses, supporting up to 8 addresses (<1-8>), which the AP reads during DHCP negotiation to locate its controller.

Option B is wrong because the AP does not immediately give up if the option43-advertised ACs are unreachable - it falls back to other discovery mechanisms such as broadcast discovery, DNS resolution, or a locally pre-configured AC address before declaring failure.

Option C is wrong because option43 adds unicast targets to the AP's discovery process but does not disable other discovery methods; the AP still sends broadcast Discovery Requests and can use alternative channels concurrently.

Option D is wrong because option43 only needs to carry the IP addresses of the AP's own active and standby AC - there is no requirement to include addresses of ACs belonging to other AP groups, which would be unnecessary and potentially disruptive.

Memory tip: Think of option43 as the AP's "personal contact card" for its own controller - you only fill in its AC's address(es) (active + standby, up to 8), and the AP is smart enough to keep trying other discovery methods if those contacts don't answer.

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