Software for Open Networking in the Cloud (SONiC) is an open-source, Linux-based network operating system (NOS) hardened in the data centers of some of the largest cloud service providers known today. It is an ideal choice for data centers seeking a cost-effective, scalable, and fully controllable NOS without sacrificing functionality or security. SONiC offers the standard networking protocols developers need and is constantly evolving with new features and updates. The source code for community SONiC is available completely publicly on GitHub. This introductory course provides an introduction to SONiC and its fundamental configurations. We also walk through a step-by-step, hands-on lab that demonstrates how to provision an EVPN VXLAN fabric using SONiC switches in a controlled environment.