Same here, we did examine headers and learn about the layers of networking, but we were also given the link to https://www.ietf.org/rfc/rfc1035.txt https://www.

Same here, we did examine headers and learn about the layers of networking, but we were also given the link to https://www.ietf.org/rfc/rfc1035.txt https://www.ietf.org/rfc/rfc1035.txt and told to implement a DNS resolver in C. We also did a peer-to-peer client. You learn a lot more by implementing it.