Network security tools

A tool is only as good as its wielder. There are many network security tool out there; some categories include tools for reconnaissance to help gather information on DNS, email addresses, and SNMP. At our fingertips, there's Nmap (Network Mapper), https://nmap.org, for exploitation development; the famous Metasploit from Rapid 7 (https://www.rapid7.com/products/metasploit/), for sniffing; Wireshark (https://www.wireshark.org/); and most importantly, one of the most advanced penetration platforms, Kali Linux (https://www.kali.org/) from Offensive Security.

We always need to remember hackers, network administrators, and cyber security professionals use network tools for different purposes. A white-hat hacker may use it to find vulnerabilities on a network before the black-hat hacker finds and exploits them. A penetration tester is trying to find and exploit any weakness in a network because it's their job.