DHCP(Dynamic Host Configuration Protocol) 觀念 Allow a server to dynamically distribute network configuration to client. DHCP server and PC clients on the the same LAN segment When DHCP send configuration infomation to the client, the information is sent with lease time. During the lease time, the DHCP server cannot assign that IP address to any other clients. Make configuration changes to all of the clients on the network in a limited amount of time. Client starts to renew a lease when half of the lease time Requests the renewal by sending a DHCPREQUEST message to the server