Network attacks have three major categories:
Reconnaissance attacks are associated with unauthorized discovery and mapping of network resources. A typical example of a reconnaissance attack is a ping sweep. Attackers can use ping sweeps to identify what IP addresses are responding to the ping. Once they identify active IP addresses, they can start determining what services and ports are open on those IP addresses.
A reconnaissance attack is the first step toward an access attack or a DoS attack.
An access attack is associated with unauthorized data retrieval. Data retrieval is classified ...