GNS3 video tutorial - without further ado, it's a great resource to share. It took two days to record! In Chinese, from beginner to advanced level, and includes a Packet Tracer video.
GNS3 is a graphical network simulator that provides an almost perfect lab environment for Cisco network engineers, administrators, and Cisco certification candidates. The GNS3 project is an open-source and free program that supports multiple operating systems, including Windows, Linux, and macOS X.