he "route planning" of data traffic on the Internet is comparable to route planning in road traffic. If you replace "roads" with "lines" and "navigation system" with "router", you get a good picture of the infrastructure of the Internet. The only difference is that the Internet is much busier than our highways. Here worldwide, more than 100,000 gigabytes per second flow through the infrastructure. That's about as much as the content of **22,000 DVDs - every second**. Tendency increasing. This makes reliable data routing even more important.