|  |  | Cisco offers many additional security devices and features. Network Address Translation (NAT) offers both increased security and provides cost savings through reduced IP address purchases. The Cisco DNS/DHCP manager integrates the benefits of DHCP with Cisco DNS servers. Cisco also offers a firewall feature to further secure the network. CiscoWorks 2000 provides configuration management of IOS's and configuration files, highlighting update requirements and providing a record of router configuration modifications.