GNS3 will typically be more feature-rich than PT’s (Packet Tracer) emulator because it boots genuine IOS images. The amount of resources (CPU / RAM) available on the PC for executing the lab’s simulated IOS images and virtual machines for clients & servers simulation is GNS3’s primary constraint. GNS3 on the other hand is a network emulator that uses Dynamips and QEMU to run genuine IOS images, virtual machines, and other network-related applications. Although it is not an open-source program, it is still widely used because of its user interface and the vast range of functions. Surprisingly, this utility includes not only Cisco equipment but also a wide range of other network equipment. This program cannot upgrade existing routers or switches because the protocols are implemented solely in software.
Cisco Packet Tracer’s major goal is to assist students to understand networking fundamentals via practical learning experience while also developing Cisco-specific abilities.
