This talk will be broken into three major parts, and will act as an introduction into the various aspects of computer security and intrusion detection concerns. First, internet attack profiles will cover network mapping, informational services, bug exploitation, advanced attacks, denial of service (DoS) attacks, and masking the intrusion. The second section will focus on defensive strategies and will covers three areas. Firewalling techniques, application proxy firewalls, and intrusion detection. Finally, a summary will talk about what to do to stay on top of your newly secured network.