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A persistent network issue is impacting connectivity for workstations in a training lab when connecting to a lab SSID. Wireless logs show clients never receive a DHCP offer when trying to obtain an IP address. The APs are operating in Local mode. Network monitoring systems indicate optimal signal quality and radio performance, VLAN assignments for the affected SSID have been configured, and all clients are affected. Which action resolves the issue?
Correct Answer: C
The fault domain is DHCP forwarding, not RF, client-side addressing, or AP discovery. Cisco explains that when a wireless client associates, it sends a DHCP Discover broadcast, and depending on AP mode, that traffic is either forwarded through the WLC or passed to the next hop. Cisco further states that if no DHCP server exists in the client's local Layer 2 domain, the router or SVI for the client VLAN must forward DHCP discovery traffic using an IP helper address. Because the APs are in Local mode, client traffic is centrally switched through CAPWAP to the WLC, where the client VLAN/SVI path must correctly relay DHCP toward the DHCP server. Cisco's Catalyst 9800 DHCP configuration guide shows DHCP relay configuration under the client VLAN SVI by entering the IPv4 helper address, and the CLI example uses ip helper- address <ip-address> to forward UDP broadcasts such as DHCP requests. Option C resolves the issue because all clients are affected and none receive a DHCP offer, indicating the DHCP Discover is not reaching the DHCP server or the offer is not returning through the relay path. DHCP option 43 is for AP controller discovery, not client DHCP addressing.
