Erratic protection for DoD information systems. Cost of protection too high. No means to cope with new technology. Once accredited, a false sense of security exists, that is until the next detected attack. This implementation also has shortfalls.
Hackers use sniffers .
Hot pursuit and active defense may not be options. There are recommended strategies to deal with hackers who enter your network. Manage your security - set policy for what is allowed, and what behavior is prohibited. Banners that announce monitoring to be read by everyone logging onto your system. Risk management - plan for the attack.