A host client on a remote subnetwork requires an IPv4 address assignment from a centralized server. Place the operational steps in the correct sequential order to illustrate how a Cisco router configured with `ip helper-address` processes and relays the initial discovery and offer messages.
- 1The host client broadcasts a DHCPDISCOVER packet with source IP and destination IP on its local subnet.
- 2The router receives the broadcast, inserts its ingress interface IP address into the giaddr field, and unicasts the DHCPDISCOVER packet to the configured helper address.
- 3The central DHCP server evaluates the giaddr field to match the correct address pool and returns a unicast DHCPOFFER packet to the router giaddr.
- 4The router receives the unicast DHCPOFFER packet on its server-facing interface and forwards it onto the client-facing subnet toward the requesting host.
Cevap
The correct operational sequence begins with the client broadcasting a DHCPDISCOVER packet on the local subnet. Next, the relay agent router intercepts the broadcast, inserts its ingress interface IP into the giaddr field, and forwards the packet as a unicast transmission to the DHCP server. The central DHCP server then matches the giaddr to its address pool and returns a unicast DHCPOFFER to the router's giaddr address. Finally, the router receives the DHCPOFFER and forwards it onto the local subnet to the host client.
The workflow follows standard DHCP relay behavior: (1) Host sends broadcast DHCPDISCOVER, (2) Relay agent populates the giaddr field with its interface IP and unicasts the request to the central server, (3) Server evaluates giaddr to select the subnet pool and unicasts DHCPOFFER back to giaddr, and (4) Relay agent forwards the offer to the local client.
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DHCP Relay Agent Operational Processing Sequence