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Nmap features include: Fast scan (nmap -F [target]) – Performing a basic port scan for fast result. Host discovery – Identifying hosts on a network. For example, listing the hosts that respond to TCP and/or ICMP requests or have a particular port open. Port scanning – Enumerating the open ports on target hosts.
Tools commonly used to perform banner grabbing are Telnet, Nmap and Netcat. For example, one could establish a connection to a target web server using Netcat, then send an HTTP request. The response will typically contain information about the service running on the host:
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Network enumeration is a computing activity in which usernames and info on groups, shares, and services of networked computers are retrieved. It should not be confused with network mapping, which only retrieves information about which servers are connected to a specific network and what operating system runs on them.
Attacks which are spread out across a long period of time or a large number of source IPs, such as nmap's slow scan, can be difficult to pick out of the background of benign traffic. An online password cracker which tests one password for each user every day will look nearly identical to a normal user who mistyped their password.
This information can be used to better attack the target. For example, open source search engines can be used to find data that can be used in a social engineering attack. Scanning: Uses technical tools to further the attacker's knowledge of the system. For example, Nmap can be used to scan for open ports.
Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing, formerly known as BackTrack. [2]Parrot Security OS is a cloud-oriented Linux distribution based on Debian and designed to perform security and penetration tests, do forensic analysis, or act in anonymity.
A port scan or portscan is a process that sends client requests to a range of server port addresses on a host, with the goal of finding an active port; this is not a nefarious process in and of itself. [1] The majority of uses of a port scan are not attacks, but rather simple probes to determine services available on a remote machine.