Nmap is a port scanner that can be run to scan hosts and return information about them. The information returned is but not limited to if the hosts are up, Services running on them, the versions of the services and Operating System running on the host.
In the example below we shall:
1. Scan the Network to show which hosts are up.
2. Scan an individual host to determine Ports open and OS.
3. Scan the host and return Additional information.
4. Save the Output of the nmap scan.
5. View the Information Saved.
6. Scan a router and return open ports and OS