Refer to the exhibit. Router R1 is being used as a rela

单项选择题

Refer to the exhibit. Router R1 is being used as a relay device for autoconfiguration of switch S1.Which configuration will acc omplish this? （）

A.S1(config)# interface fastethernet 0/1   S1(config - if)# ip helper - address 10.0.0.2
B.S1(config)# interface fastethernet 0/1   S1(config - if)# ip helper - address 20.0.0.1
C.R1(config)# interface fastethernet 0/0   R1(config - if)# ip help er - address 20.0.0.2R   1(config - if)# ip helper - address 20.0.0.3   R1(config - if)# ip helper - address 20.0.0.4   R1(config - if)# exit   R1(config)# interface fastethernet 0/1   R1(config - if)# ip helper - address 10.0.0.1
D.R1(config)# interface fastethernet 0/0   R1 (config - if)# ip helper - address 20.0.0.1   R2(config)# interface fastethernet 0/0   R2(config - if)# ip helper - address 20.0.0.1   R3(config)# interface fastethernet 0/0   R3(config - if)# ip helper - address 20.0.0.1   R4(config)# interface fastethernet 0/0   R4(config - if)# ip helper - address 20.0.0.1
E.S1(config)# interface fastethernet 0/1   S1(config - if)# ip helper - address 10.0.0.2   R2(config)# interface fastethernet 0/0   R2(config - if)# ip helper - address 20.0.0.1   R3(config)# interface fastethernet 0/0   R3(config - if) # ip helper - address 20.0.0.1   R4(config)# interface fastethernet 0/0   R4(config - if)# ip helper - address 20.0.0.1

CCNP(642-902)