![]() ![]() This takes a while, so we'll speed up the video. I'll run nmap dash capital A and I'll add a lower case v to be more verbose. ![]() We can direct Nmap to try to discover even more information about a system with the -A option, which tries to guess the operating system and can show information like SSH host keys and responses from common attempts to communicate with services on ports that Nmap discovers. And here I can see UDP ports on the system as well. I can look at both TCP and UDP ports using the command nmap-sS-sU and my target address. And there are services that operate using UDP. This type of scan only looks for TCP ports though, not UDP. I can see that that system has SSA running on port 22 and a web service on port 80. And the most basic type of scan is to just write nmap and the target address. We can perform scans using a variety of parameters. One of the most general uses of Nmap is a basic port scan, where we scan a system or device to see what ports are open or are accepting traffic from other systems on the network. We shouldn't scan systems that we don't have permission to scan. In this episode though, we'll take a look at a few basic scans that can be useful if you're working with your own systems on your own network. More information is available in the man pages or online at /book/man.html. And it shows us a basic introduction describing how to use the software. Before really using Nmap for anything, I'll run the command without any options. Here on this Fedora system, I can make sure that Nmap is installed with dnf install nmap. Exposed ports can tell us what services a system is running and knowing what ports are open on a system can be useful when we're ensuring the security of a computer or device on our network. Nmap is a tool that lets us scan network devices to see what ports they have exposed to traffic.
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