Network World has been around now for 25 years, and in that time the technology it covers has changed dramatically, from the first firewalls to intelligent intrusion/prevention, from analogue modems to DSL, from five inch floppies to thumb drives. It's been quite a ride. Here's a brief quiz to test your knowledge of some of what's been happening over that time. Keep track of your score and check at the end how well you stack up. Enjoy.