"Complete network device configuration simulator."
If you work with networks, configuring devices, and are looking for a network simulation tool with multiple visual representations, in which you can insert packets as you like and create network typologies, what you need is Packet Tracer.
Packet Tracer has been designed as a learning and interactive network simulation tool for teachers and students of Cisco CCNA. The program has been created with the aim of being used as an educational product, to learn while you practice. The program is very easy to use, as you just drag and drop devices to the screen, and click on them to access the configuration consoles. Once the physical and logical configuration is complete, you can also simulate connectivity, pings, traceroutes, etc.
So you can work comfortably, Packet Tracer allows multi-user configurations in real time, it is multi-area, and compatible with the most popular network protocols (HTTP, TCP/IP, Telnet, SSH, TFTP, DHCP, DNS, TCP/UDP, PPP, etc).