With that command you can see if the helper address (dhcp relay) is configured.
Router1#sh ip interface g0/0
GigabitEthernet0/0 is up, line protocol is up (connected)
Internet address is 10.0.0.1/30
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is 192.168.4.2
The function of the DHCP relay agent is to forward the DHCP messages to other subnets so that the DHCP server does not have to be on the same subnet as the DHCP clients.
The DHCP relay agent transfers DHCP messages from the DHCP clients located on a subnet without a DHCP server, to other subnets.
You can type partial words and it works, like you can type 'copy run start' instead of the whole 'copy running-config startup-config'. Even just 'sh ip int' would work.
DHCP relay agent means: a router interface is getting its ip address automatically through dhcp, this normally happens between two connected router. After a Dhcp server has already been configured in the network, you'll issue this command on the router's interface "ip address dhcp"
Router1#sh ip interface g0/0
GigabitEthernet0/0 is up, line protocol is up (connected)
Internet address is 10.0.0.1/30
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is 192.168.4.2
Router2(config)#interface gigabitEthernet 0/0
Router2(config-if)#ip address dhcp
Router2(config-if)#no shutdown
Router2#show ip interface g0/0
GigabitEthernet0/0 is up, line protocol is up (connected)
Internet address is 10.0.0.2/30
Broadcast address is 255.255.255.255
Address determined by DHCP
MTU is 1500 bytes
Helper address is not set
It is not like this kadamske, DHCP relay is when you configure the Helper address on a router interface. That router is not the DHCP server, but can inform the devices on the network about the IP of the DHCP server.
When a device does not know the IP address of a DHCP server, it broadcast a DHCPDISCOVER, and routers do not retransmit broadcast, so if the DHCP server is beyond the network, the device will not find it. Instead with the helper address, it can transmit a unicast packet directly to the DHCP server.
Right answer still D, because you can see the helper address with that command.
And the only way to verify that is with the command " Show ip interface xx
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