After the wireless user connects to the wireless signal point, the IP address cannot be obtained. What are the possible reasons? (Multiple choice)

Question

Options

• AThe VLAN where the user is located is not configured with a DHCP server
• Bdhcp-enable is not configured on the wlan-ess virtual interface
• CThe authentication password specified by the user is incorrect
• DThe MAC address of the user equipment has been added to the blacklist

• A
  72% (21)
• C
  10% (3)
• D
  17% (5)

Explanation

A is correct because without a DHCP server configured in the user's VLAN, there is no service to lease IP addresses - the request simply goes unanswered. B is correct because dhcp-enable must be explicitly configured on the wlan-ess virtual interface to allow it to relay or process DHCP requests; without it, the interface drops DHCP traffic even if a DHCP server exists elsewhere.

C is wrong because an incorrect authentication password prevents the user from associating with the wireless network at all - the user would never reach the IP address request stage. D is wrong for the same reason: a MAC blacklist blocks layer-2 association entirely, so the device cannot connect to the signal point in the first place, let alone request an IP.

Memory tip: Think in stages - blacklist and wrong password block connection, while missing DHCP server or disabled DHCP on the interface block IP assignment. The question specifies the user has already connected, so only post-association failures (A and B) are relevant.

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