A DHCP client is a host configured to request IP addressing information automatically. It sends DHCP messages to obtain an address lease and related options such as subnet mask, default gateway, DNS server, and lease duration. The server is the device that owns the address pool and assigns addresses. A workstation that requests a domain name for an IP address is using DNS behavior, not DHCP client behavior. A router can relay DHCP messages or host DHCP pools, but it is not described as a DHCP client unless its own interface is configured to obtain an address dynamically. Cisco CCNA 200-301 v1.1 IP Services expects candidates to separate DHCP client, DHCP server, and DHCP relay functions. In the DHCP exchange, the client initiates discovery because it needs configuration. Therefore, the correct definition is a host that is configured to request an IP address automatically.
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