The ip helper-address command does what?

A.
assigns an IP address to a host

B.
resolves an IP address from a DNS server

C.
relays a DHCP request across networks

D.
resolves an IP address overlapping issue

Explanation:
When the DHCP client sends the DHCP request packet, it doesn’t have an IP
address. So it uses the all-zeroes address, 0.0.0.0, as the IP source address. And it doesn’t know
how to reach the DHCP server, so it uses a general broadcast address, 255.255.255.255, for the
destination.
So the router must replace the source address with its own IP address, for the interface that
received the request. And it replaces the destination address with the address specified in the ip
helper-address command. The client device’s MAC address is included in the payload of the
original DHCP request packet, so the router doesn’t need to do anything to ensure that the server
receives this information.