Hi,<p>As a developer, I know some fundamentals of networking (OSI layers, how protocols work, some basic tools like ping, nslookup, netstat etc. ) but I want to learn more. For examples, interfaces in linux, bridges, routing, iptables etc.<p>What do you recommend? Course/Book/Tutorial/Repo? Personally, I don't like very old books which are full of colorless text. I like resources which follow the approach "Explain like I'm 5"