By Alex WilliamsIn four years, Internet Protocol (IP) traffic will increase fourfold to 767 exabytes, or more than three-quarters of a zettabyte. That is equivalent to 16 billion DVDs; 21 trillion MP3's; or 399 quadrillion text messages. That's the conclusion of Cisco's annual Visual Networking Index, a report that demonstrates how data will soon become ubiquitous and why the networking race is becoming one to watch.ng>Discuss