This tutorial provides a basic overview or introduction to the GNS3 graphic user interface (GUI). Learn how to use or create and test your first GNS3 topology.

This tutorial compares Cisco Packet Tracer, GNS3, and Cisco VIRL and explains their advantages, disadvantages, similarities, and differences.

This tutorial explains the key differences between emulation and simulation. Learn what emulation and simulation are and how they work.

This tutorial explains what GNS3-all-in-one and GNS3-VM are and how they work. Learn the differences between GNS3-all-in-one (GNS3 client) and GNS-VM (GNS3 Server).

This tutorial explains what an LSA is, LSA types, LSA data structure, LSA flooding, and how OSPF uses an LSA to exchange network information.

This tutorial explains interior gateway protocol (IGP), exterior gateway protocol (EGP), and autonomous system (AS) and lists the differences between IGP and EGP.