Dynamic Host Configuration Protocol (DHCP) is a network management protocol that automatically assigns IP addresses and configuration parameters to devices on TCP/IP networks through a client-server model. Operating at the application layer and using UDP ports 67 (server) and 68 (client), DHCP eliminates manual IP configuration, prevents address conflicts, and centralizes network administration. The protocol employs a sophisticated lease management system where addresses are temporarily assigned and automatically renewed, enabling efficient address space utilization across dynamic networks. Understanding DHCP's multi-phase communication handshake, option-based extensibility, and relay mechanisms is essential because even minor misconfigurations—like incorrect scope boundaries or missing relay agents—can prevent entire subnets from obtaining network connectivity, while mastery of advanced features like failover, snooping, and DHCPv6 enables you to build resilient, secure, and scalable IP infrastructure.