Network Security
Network security consists of the provisions made in an underlying computer network infrastructure, policies adopted by the network administrator to protect the network and the network-accessible resources from unauthorized access and the effectiveness (or lack) of these measures combined together.
Network Sniffing
Network sniffing refers to a computer connected to a network through "promiscuous mode", listening to every bit of traffic that goes by on the network and captures all the data. Normally a computer's network connection ignores traffic that is not addressed to it, but with sniffing software the computer will pick up everything. This is an easy way to pick up clear text passwords. E-mail programs frequently use clear text passwords.
From : http://www.networkdictionary.com/security/n.php#13
Metasploit Framework
The Metasploit Framework is an advanced open-source platform for developing, testing, and using exploit code. This project initially started off as a portable network game and has evolved into a powerful tool for penetration testing, exploit development, and vulnerability research.
The Framework was written in the Perl scripting language and includes various components written in C, assembler, and Python. The widespread support for the Perl language allows the Framework to run on almost any Unix-like system under its default configuration. A customized Cygwin environment is provided for users of Windows-based operating systems. The project core is dual-licensed under the GPLv2 and Perl Artistic Licenses, allowing it to be used in both open-source and commercial projects.
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