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Packet Tracer is a routing and switching emulator provided by Cisco free of charge. It is capable of emulating reasonably complicated routing and switching scenarios and is perfect for students studying for their CCNA. Although it does not offer all the BGP commands for the CCNP as GNS3 or Dynamips It has one very valuable feature over these applications, it supports level 2 and 3 switching simulation with devices like the 2950 and 3560 as well as generic device that allows the user to create devices with other interfaces such as the NM-1FFE and NM-1FGE. It supports a fairly broad range of commands allowing the user to create extremely advanced switching scenarios. I myself have completed several switching lab with Ether Channel, VTP, MLS, and more. While you cannot implement some features like HSRP, Packet Tracer is by far the best switch simulator available outside of purchasing actual hardware. Additionally you do not have to obtain Cisco IOS's in order to use Packet Tracer. Packet Tracer can also be used for the CCNA Voice and Wireless Practice labs as it also includes the Cisco 7960 IP phone and wireless routing devices. The current version of Packet Tracer is 5.3.1 and can be found on a number of websites for the Windows and Linux GNU platforms. It requires the following system requirements:
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Find advanced switching labs for Packet Tracer and GNS3 at Free Cisco Lab along with other free lab scenarios an exam preps.
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