Ding Dong Ditcher: Nmap
Network Mapper (Nmap) is an open source utility that allows the user to gain insight into the network operating system. This tool sends its own raw packet to the host and records and analyzes its response, obtaining info regarding the host and services on the OS, firewalls, and current state of the computer. Developers have implemented scripts to evolve Nmap's service and vulnerability detections, redirection services, and more. Nmap can be used to infiltrate networks, but more importantly serves as a crucial line of defense for students who aim to be system and network administrators.