2. Retrieve information, modify network behavior

The intruder has now established a precise list of the various operating systems present on a network, using the techniques presented in paragraph 1 . The intruder is now keen to determine which systems to focus on.

Unfortunately for him, many systems are protected by security mechanisms, and he needs to get an idea of how important a system is without succeeding in an intrusion. on each of them, as this would take too long...