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→Port Scanning
== Port Scanning ==
Port scanning involves the use of software designed specifically to scan all the ports on a system to find out which ports are open and have services running behind them. Port scanners are best run externally, in other words on another system on the network, as opposed to the system being tested. Port scanning need not be an expensive undertaking. In fact a wide selection of extremely comprehensive scanning tools are available for download on the internet.
After execution, the port scanner will generate a report listing the services and vulnerabilities present on the target system. Use this information to decide which non-essential services can be disabled.
Port scanning should be performed on a regular basis and the results compared against base line data to ensure that nonessential services have not been enabled without the administrator's knowledge.
== Primary TCP/IP Ports and Assignments ==
