network programming

hi all
I am doing my CCIE R&S and I have interest in Network Programming,
but I am not sure what exactly this can provide for me ?
so when I will be a network programmer, what can I do ?
can I write a network protocol ?


also I saw that I can do network programming with various languages which made me confused more which one should I use,
so does c++ is the right choice for me ?


many thanks,
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