How work Nmap ? Hackers use chain tools to check open port on your system
In this video, we tested the system with the Nmap tool, found open ports, and examined them with the Wireshark tool.
The nmap tool, which stands for Network Mapper, is a powerful, open-source, command-line scanner for network discovery and security assessment. Its main use is to send specific packets to destination hosts and analyze the received responses to determine vital information such as the state of ports (open, closed, or filtered), running services along with the exact version number of the software, the host operating system type, and even the presence of firewalls or intrusion detection systems. The tool supports a variety of scanning techniques such as TCP SYN, UDP, FIN, and passive scanning, and using its advanced scripting engine (NSE), it is able to execute hundreds of ready-made scripts for vulnerability detection, identification of security holes, and discovery of specific services such as SMB or HTTP. nmap is used both by network administrators in troubleshooting connections and infrastructure audits, and by security professionals in the phase of detecting intrusion attacks, but it should be noted that scanning networks without permission is illegal in many countries and is only allowed on systems owned by the person or with written permission. Finally, nmap output is flexible and can be presented in regular, XML, or processable formats by other tools, making it one of the most essential tools for any network and security professional.
0:00 introduction
0:25 ping scan
0:50 start nmap
2:10 TCP scan
3:40 UDP scan
5:00 service and version detection
6:10 Operating System (OS) detection
7:15 discovery
8:13 TCP SYN scan
9:25 TCP FIN scan
10:10 TCP ACK scan
10:50 TCP Null scan
11:25 TCP Xmas scan
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