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ccna cost of exam.10. 1.3 DHCPV4 Relay AgentIn a large network, there may be multiple subnets o DHCPv4 clients get an IPv4 address after obtaining a response from a DHCPv4 server via a network broadcast message. But broadcast messages cannot cross subnets. in Figure 10-3. the DHCPv4 client PC1 and the DHCPv4 server Serverl are on different subnets. how does PC1 request an IPv4 address from Serverl?.136.Cisco Networking Lab CCNA Lab Guide (Release 2)One solution to the above scenario is for the administrator to add DHCPv4 servers on all subnets. However. this introduces additional cost and administrative overhead. Another solution is to use a DHCPv4 relay agent, as shown in Figure 10-3. Configure the IOS Helper Address feature on the intermediate router or switch. this solution enables the router to forward DHCPv4 broadcast messages from the client to the DHCPv4 server. When the router forwards DHCPv4 request messages, it acts as a DHCPv4 relay agent. To configure router R1 as a DHCPv4 relay agent, you need to configure the helper address on the interface closest to the client (in this case, R1's G0/1 interface) using the command ip helper-address address. Assuming that router R1 is now configured as a DHCPv4 relay agent, it receives DHCPv4 broadcast messages from PC1 and forwards them to the DHCPv4 server as unicast messages with a source address of 172.16.2.1 and a destination address of 172.16.1.100 (both the source and destination ports are UDP67).0.1172.16.1.0/24 DHCPV4K Server DHCPV4 Relay Agent DHCPv4 ClientFigure 10-3 DHCPv4 Relay Agent.1 172.16.2.0/2410.2 DHCPv6 OverviewDHCPv6 is a protocol based on the client/server model used to assign the required IPv6 addresses/prefixes and other network parameters to IPv6 hosts working on an IPv6 network. IPv6 hosts can use StatelessAddress AutoConfiguration (SLAAC) or DHCPv6 to obtain IPv6 addresses.