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Programming the Network Stack

Networks are the connective tissue of modern software — understanding how to program them at the socket level gives us insight that no amount of high-level abstraction can replace. First, you need to understand TCP/IP – the foundational protocol suite that powers the Internet and most local networks. TCP/IP stands for Transmission Control Protocol/Internet Protocol, a layered set of rules that govern how data is packaged, addressed, transmitted, and received between computers. At a high level, IP handles addressing and routing, ensuring that data reaches the correct destination, while TCP ensures that data is delivered reliably and in order. Together, they enable computers to exchange information transparently across diverse hardware and networks. Port numbers help identify specific services or applications running on a device. While an IP address identifies a host on the network, a port number specifies which process on that host...