Port Scanning

Port scanning is a technique used to identify open ports on a network host. Each program on a device is assigned a port number to ensure correct data delivery. While hackers may use port scanning for reconnaissance, network administrators use it to verify security protocols. Tools like nmap can detect open ports to assess network security. However, port scanning should not be conducted without permission, as it may be seen as a precursor to an attack.

What tool can be used to detect open ports on a network?

Why should port scanning not be done without permission on company networks?