interface FastEthernet0/1ip helper-address 10.0.1.1!access-list 100 permit udp host 10.0.1.1 eq bootps host 10.148.2.1. DHCP relay must be configured on the interface that receives the client broadcasts, because DHCPDISCOVER messages are local broadcasts and routers do not forward them by default. The ip helper-address command converts the client broadcast into a unicast message toward the DHCP server. DHCP uses UDP, not TCP, and the relevant server-side port is BOOTP server UDP 67. Therefore an option that references TCP cannot be correct. Cisco CCNA 200-301 v1.1 IP Services tests this because DHCP relay is common when clients and servers are on different subnets. The corrected answer applies ip helper-address to FastEthernet0/1, the client-facing interface, and permits the necessary UDP DHCP traffic. Configuring the helper on the wrong interface or using TCP would leave clients unable to obtain addresses from the central DHCP server.
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