You should be familiar with the major Unix tools e.g. grep, awk, find, ... , and know about their most commonly used command-line options.
You should know about layers, protocols, addresses, cables, plugs, etc. If you are new to this field, here is one good starting point for you: linuxports/howto/intro_to_networking
You should definitely have some experience in IPv4 configuration, otherwise it will be hard for you to understand what is really going on.
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