GNS3
GNS3 is a free, open-source network simulation tool that emulates complex network topologies using real Cisco, Juniper, and other vendor devices. Ideal for network certification training (e.g., CCNA/CCNP), it enables virtual labs, testing, and troubleshooting without physical hardware. Supports multi-vendor environments via integrations like QEMU and Docker.
windows
linux
mac
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