Answer D,E is correct: D. minimizes the necessary number of DHCP servers; E. configured under the Layer 3 interface of a router on the client subnet. A DHCP relay agent lets clients on a subnet use a DHCP server located somewhere else in the network. The relay is configured on the Layer 3 interface that receives the client DHCP broadcasts, normally with the ip helper-address command. This design reduces the number of DHCP servers required because one centralized server can support many client VLANs. Cisco IOS also allows more than one helper address under an interface, so the statement saying only one helper is permitted is not correct. Cisco CCNA 200-301 v1.1 IP Services expects engineers to understand why DHCP relay exists: routers do not forward broadcasts by default, so the relay converts the client broadcast into a routed unicast toward the server. The corrected choices are the features that describe centralized DHCP support and client-subnet interface placement.
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