TCP and UDP transport<br><br>Sockets: elementary, advanced, routed, and raw<br><br>I/O: multiplexing, advanced functions, nonblocking, and signal-driven <br><br>Daemons and inetd<br><br>UNIX domain protocols<br><br>ioctl operations<br><br>Broadcasting and multicasting<br><br>Threads<br><br>Streams<br>
