![]() ![]() This exercise will concentrate on TCP port scans only.īasically, performing a TCP port scan consists of sending connection attempts (SYN packets) against TCP ports on the target system and then analyzing the response or lack of it from the target system in order to determine which ports are open, meaning there is a network service listening on those ports and that service is accessible from the attacking system, closed, meaning no service is listening on them, or filtered, meaning those ports are not accessible from the attacking system because some network element is blocking the traffic directed to them. ![]() Port scanning is especially effective against TCP services whereas for UDP services it is much less reliable. One of the first stages in many network based attacks is the gathering of intelligence about the target system and port scanning is one of the most common techniques used for this purpose. ![]()
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