One of Linux's main claims to fame is its robust networking, especially TCP/IP support. And, if you guessed that the TCP/IP stack is in the Linux kernel, you're right! The kernel provides a standards-compliant, high-level interface for programs that want to send data over the network. Behind the scenes, the Linux kernel interfaces directly with your particular ethernet card or pppd daemon and handles the low-level Internet communication details. Note that the next tutorial in this series, Part 7, will deal with TCP/IP and networking.