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What does the command "ip helper-address 172.16.11.2" accomplish on router _R1?
Forwards DHCP requests from DHCP Clients to 172.16.11.2.
Resolves overlapping issues of IP addresses with the help of the DHCP Server.
Forwards packets from 172.16.10.0/24 network to 172.16.11.2.
Configures the DHCP server on the router R1, so interface f0/0 can get DHCP information.
The routers connecting the networks need to somehow relay DHCP messages between clients and DHCP server situated on different networks. On a routers LAN interface the command ip helper-address [server-ip] identifies the DHCP Server by its IP address. Specifying the address of the DHCP server allows the router to relay broadcast traffic destined for a DHCP server to that server. For more information refer to: [Todd Lammle. - CCNA Routing and Switching Study Guide 2013, Chapter 7]
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