Windows Server Family, Linux are some examples. And also there are some routers that have the DHCP service enabled.
The Integrated Router is both a DHCP client and a server (p 186 BMF)
integrated services router
DHCP Server can be a standalone server
yes DHCP require the authorization of the dhcp server before IP addresses can be allocated because until we authorize DHCP server the network does not know who is the dhcp server for the subnet. The DHCP server broadcasts the information to all.
How to install the DHCP in win 8 server
(DHCP) Dynamic host Configuration Protocol. The Default Port Number is: for DHCP client : 546 for DHCP server : 547
/etc/rc.d/init.d/dhcpd
dhcp has to be authorized
dhcp-client
DHCP server configuration in /etc/dhcp/dhcpd.conf(FEDORA)or /etc/dhcpd.conf (RHEL).
Usually nothing, today all routers have a DHCP server included.
Router is usually configured as a DHCP client for WAN (Internet) network and as a DHCP server for local network.