Q1. The following configuration commands are issued at the Ethernet 0 of a router (RouterA):
RouterA(config-if)# ip address 172.25.8.89 255.255.255.0
RouterA(config-if)# ip helper-address 172.25.9.3
Which of the following statements is correct?
A. All DHCP broadcasts from interface Ethernet 0 are forwarded to the designated server at 172.25.9.3
B. All DHCP broadcasts from interface Ethernet 0 are forwarded to the designated server at 172.25.8.89
C. All DHCP broadcasts from interface Ethernet 0 are forwarded to all servers on the subnet 172.25.8.0
D. All DHCP broadcasts from interface Ethernet 0 are forwarded to all servers on the subnet 172.25.9.0
Correct Answer: A
IP helper addresses forward a client broadcast address (such as a DHCP or DNS request) to a unicast or directed broadcast address. Helper-address is required due to the fact that routers do not forward broadcasts. By defining a helper-address, a router will be able to forward a broadcast from a client to the desired server or network. There can be more than one helper-address on a network. The helper-address must be defined on the interface that receives the original client broadcast. The command ip helper-address 172.25.9.3, defined on interface e 0 of routerA will route the broadcasts originating at that interface to network resource at 172.25.9.3.
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