Which of the following provides a client device with an IP address?

DNS (Domain Name System) resolves human-readable domain names into IP addresses, but it does not assign IP addresses to client devices.

DHCP (Dynamic Host Configuration Protocol) automates the process of assigning unique IP addresses, subnet masks, default gateways, and DNS server information to client devices, allowing them to communicate on the network. Without a valid IP address, a client device cannot participate in IP-based network communication.

IPSec (Internet Protocol Security) is a suite of protocols used to secure IP communications by authenticating and encrypting each IP packet, but it does not assign IP addresses.

SMB (Server Message Block) is a network file sharing protocol used for providing shared access to files, printers, and serial ports, but it does not assign IP addresses.