The DHCP server in Windows Server 2008 R2 has invested in the areas of security, reliability, manageability and usability. Similarly on the DHCP Client in Windows 7 has invested on certain optimization for obtaining IP Address.
The following changes are available in DHCP server in Windows Server 2008 R2:
· Supports MAC address based network access control mechanism, with the Link Layer based Filtering feature. With this feature DHCP Administrator can control issuance/denial of DHCP leases/IP addresses.
· Supports prevention of name squatting issues caused due to non-Windows OS machines, with the Name Protection feature. Using this feature one could prevent registration of non-Windows OS machine with a same name that is already registered for another machine in DNS Server.
Full Article – http://blogs.technet.com/teamdhcp/archive/2009/02/26/new-features-in-dhcp-for-windows-server-2008-r2-windows-7.aspx