I work as a backend engineer. In my current role, I work on making APIs but have also had a lot of work with respect to setting up the Infrastructure for new microservices in AWS. One of these tasks included setting up a VPC and making ingress rules and whitelisting certain endpoints to the VPC.

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It got me wondering how much knowledge of networks is required to have a deep understanding of the systems we make ? Do we need to have an in depth understanding of various networking protocols and their internal workings or is it just sufficient to know the HTTP Status Codes ?

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If so, what are the resources you used to learn networks ?