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Graphical Network Simulator-3 (shortened to GNS3) is a network software emulator first released in 2008. [ 2 ] [ 3 ] [ 4 ] It allows the combination of virtual and real devices, used to simulate complex networks.
Packet Tracer is a cross-platform visual simulation tool designed by Cisco Systems that allows users to create network topologies and imitate modern computer networks.The software allows users to simulate the configuration of Cisco routers and switches using a simulated command line interface.
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The Internetworking Operating System [2] (IOS) is a family of proprietary network operating systems used on several router and network switch models manufactured by Cisco Systems.
Dynamips is an emulator computer program that was written to emulate Cisco routers.It was developed by Christophe Fillot, who began working on it in August 2005. Dynamips runs on FreeBSD, Linux, Mac OS X and Windows.
A wildcard mask is a sequence of numbers used in computer networking to specify a range of IP addresses for access control.
Network performance could be measured using either active or passive techniques. Active techniques (e.g. Iperf) are more intrusive but are arguably more accurate.Passive techniques have less network overhead and hence can run in the background to be used to trigger network management actions.
Ettercap is a free and open source network security tool for man-in-the-middle attacks on a LAN.It can be used for computer network protocol analysis and security auditing.It runs on various Unix-like operating systems including Linux, Mac OS X, BSD and Solaris, and on Microsoft Windows.