They will try to find a weak spot in the system.How many gates are there, how many are open, what’s behind the door, how secure the doors are, etc.

How the bank operates, the building structure.They will try to gather information about the bank as much as they can through active or passive reconnaissance. The first step most likely is information gathering. What is the first step those robbers are going to perform? Let’s imagine a group of robbers that’s planning a bank heist, like in the movies. We’ll use an analogy to describe how important network discovery really is. So, what is network discovery? In simple terms, network discovery is the process of finding out the devices that are on the network. If you think you’re knowledgeable enough about network discovery, you could skip this section. In this section, we’ll be talking about what network discovery is and why is it important. We already said Nmap is a network discovery tool. Scanning specific ports or a range of portsīefore we take a deep dive into Nmap commands, we need to learn more about what it does.Finding out active hosts within a range of IP addresses.A brief word of caution before we get started.Nmap Scan Types – Host Discovery, Port Scan, OS detections, and Service detections.Install Nmap on CentOS and other RPM Based Distros.Install Nmap on Ubuntu and other Debian Based Distros.

Nmap can be used in a variety of ways depending on the user's level of technical expertise.

It was designed to rapidly scan large networks, but works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap ('Network Mapper') is a free and open source utility for network discovery and security auditing. Reference guide for scanning networks with Nmap.

Advanced nmap