GNS3

GNS3 is a graphical network simulator that allows simulation of complex networks. To provide complete and accurate simulations, GNS3 is strongly linked with: Dynamips, a Cisco IOS emulator.

Free
Open Source
Mac OS X
Windows
Linux

gns3 is a graphical network simulator that allows simulation of complex networks.

to provide complete and accurate simulations, gns3 is strongly linked with:

dynamips, a cisco ios emulator.qemu, a generic and open source machine emulator and virtualizer.virtualbox, a free and powerful virtualization software.gns3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to study for certifications such as cisco ccna, ccnp, ccip and ccie as well as juniper jncia, jncis and jncie.

it can also be used to experiment features of cisco ios, juniper junos or to check configurations that need to be deployed later on real routers.

thanks to virtualbox integration, now even system engineers and administrators can take advantage of gns3 to study redhat (rhce, rhct), microsoft (msce, msca), novell (clp) and many other vendor certifications.

this project is an open source, free program that may be used on multiple operating systems, including windows, linux, and macos x.

Links to official GNS3 sites

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The Best 6 GNS3 Alternatives

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Cisco Packet Tracer

Packet Tracer is an essential learning tool used in these Cisco Networking Academy courses: IT Essentials, CCNA Routing and Switching, CCNA Security, Intro to Internet of Things (IoT), and Mobility Fundamentals. .

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NetSim

NetSim for CCNP Network Simulator is now updated to support the new ROUTE, SWITCH and TSHOOT technologies.

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Free SNMP Agent Simulator

Verax SNMP agent simulator allows IT personnel to build virtual, simulated networks of devices without purchasing any additional hardware, for instance for testing...

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Dynamips

Dynamips is an emulator computer program that was written to emulate Cisco routers.

Free Open Source Mac OS X Windows Linux
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Cisco Packet Tracer Mobile

Cisco Packet Tracer mobile is a freely available network emulation stack centered around Cisco routers, firewalls, and switches. The mobile version is freely available...

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GNS3

Links to official GNS3 sites

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The Best 6 GNS3 Alternatives

Cisco Packet Tracer

NetSim

Free SNMP Agent Simulator

Dynamips

Cisco Packet Tracer Mobile

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