The 100MB/s figure was if you were to go into high-bandwidth media hosting, e.g. RTSP video on demand. I've been recently looking into ways to tie Darwin Streaming Media Server into moodle as a resource link, and so that figure wasn't pulled completely out of thin air!
For usual moodle hosting, IMO, 2MB/s will handle your average load, but I'd seriously consider nearer 10MB/s given the potential levels of concurrency you're expecting. You don't want the server grinding to a halt at that critical moment when everyone in the class presses submit .
Hardware and performance
Firts Steps in Moodle and Solution for 200 concurrent users
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