Subjects you'll want to pursue include networking topologies and technologies, including wireless and wired LANs, MANs, WANs, and long-haul high-bandwidth infrastructure technologies (e.g. SONET). They also include networking protocols and service, especially the huge subject area that is TCP/IP. You'll also want to understand fundamentals of network management, security, and design as well. On the development side, you'll want courses...
in programming language design, algorithms, various math courses (linear algebra, discrete mathematics, automata theory, and set theory are all particularly helpful for would-be computer scientists and software developers), plus whatever languages you choose to pursue.
On the languages side, I'd recommend C+ and some object-oriented language like Java or C# (pronounced "C-sharp"). All of these languages are widely used for networking software and operating system development, and should stand you in good stead.
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