Brother HL-4000CN - Manual (Page 67)

9-4
Using DHCP to Configure the IP Address
Dynamic Host Configuration Protocol (DHCP) is one of several automated
mechanisms for IP address allocation. If you have a DHCP Server in your network
(typically a Unix, Windows NT/2000/XP or Novell Netware network) the print
server will automatically obtains its IP address from DHCP server and register its
name with any RFC 1001 and 1002-compliant dynamic name services.
Other Source of Information
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http://solutions.brother.com/ for more information on TCP/IP protocol.