You write code that talks to databases, calls external APIs, and serves thousands of users simultaneously. But when something breaks, do you really understand what happens between your application and the outside world? Most backend developers focus entirely on application logic and forget that their code depends heavily on network infrastructure.
I learned this the hard way three years ago. My REST API worked perfectly in development but failed randomly in production. Users complained about timeouts and connection errors. I spent days checking my code logic, database queries, and server configurations. The problem turned out to be a simple network issue that took my senior colleague five minutes to identify. That day taught me something important: understanding networks is not optional for backend developers.