Cisco PacketTracer 5.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer is commonly called PacketTracer5.exe.
This free tool was originally developed by Cisco Systems, Inc. The program lies within Internet & Network Tools, more precisely Network Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most popular versions of the tool 5.1 and 4.1.
From the developer:
Cisco Packet Tracer is a powerful network simulation program that allows students to experiment with network behavior and ask “what if” questions. As an integral part of the Networking Academy comprehensive learning experience, Packet Tracer provides simulation, visualization, authoring, assessment, and collaboration capabilities and facilitates the teaching and learning of complex technology concepts.
You may want to check out more software, such as Cisco Packet Tracer, Cisco Phone Designer or Cisco IP SoftPhone, which might be similar to Cisco PacketTracer.
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