There are some good videos on Paxos and Raft. You can also learn your way around Zookeeper. Dist systems is a huge topic .. several text books exist along with

There are some good videos on Paxos and Raft. You can also learn your way around Zookeeper. Dist systems is a huge topic .. several text books exist along with courses. Networking is also very broad but not really a dist systems specific topic. Do you want to learn SDN or how networking works at the low level or something else.