Who has planned for a career before college?

I have seen many companies offer entry positions in Telecom Network Engineer, Software Engineer, etc. Their education requirement is usually just BS in CS or Computer or Electrical Engineering. But with requirements like knowing stuff that ain't taught in school. Even some basic stuff like TCP/IP programming is never taught in a formal course. Why would knowledge to maintain SONNET, or MPLS ethernet backbones, or administrating Oracle DB are considered to be essential? Maybe just my university is not teaching them?