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For most learners, is the clear winner. It runs on modern PCs, supports Python scripting, has a much cleaner interface, and includes wireless security (WPA2, 802.1X) and IoT devices. Cisco Packet Tracer 5.2.0 Download
The company has moved on to versions 7.x and 8.x, and they offer the latest version for free via the Cisco Networking Academy. This article is for educational purposes