... con-sultant in network architecture and security for a variety of orga-nizations, corporations, and governments. For over 10 years, hehas been involved in IP networking as a network architect, ... positions of Network Security Officer and Computer Systems Security Officer while serving in the United States Air Force. 112_IpSec_FM 11/8/00 8:52 AM Page ixTraffic Filtering on the Cisco IOS • ... 1Protecting a Private Network When only protecting a private network, the security factors concerningthe Internet have already been addressed or are not an issue. However,with the networks of today...