300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ502

Layer 3 Technologies

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Refer to the exhibit. In the partial router-on-a-stick configuration, clients in VLAN 10 on Gi2 cannot obtain IP configuration from the central DHCP server. The DHCP server can be reached by a successful ping from the router. Which action resolves this issue?

  • A Configure the ip helper-address 192.168.255.3 command on the Gi2.10 subinterface.
  • B Configure a valid IP address on the Gi2 interface so that DHCP requests can be forwarded.
  • C Configure the ip dhcp pool 1 and network 192.168.210.0 255.255.255.0 commands.
  • D Configure the ip dhcp excluded-address 192.168.255.3 command on the Gi2.10 subinterface.
Explanation

A DHCP relay agent is enabled on the interface where ip helper-address is configured and forwards DHCP broadcasts received on that interface to the specified server. VLAN 10 traffic is terminated on subinterface Gi2.10, which has gateway address 192.168.210.1, so ip helper-address 192.168.255.3 must be configured on Gi2.10 rather than on the unnumbered physical Gi2 interface.

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