ZDNet has a Q&A with Ken Silva, the chief technology officer of Verisign, which owns one of the Internet's root servers. He shares his company's predictions:

We are prepared for 4 trillion queries per day, and we're doing 60 billion per day right now. We expect given the dynamics, we'll have to add 1,000 [times] to that capability. We're looking at a capacity of 4 quadrillion queries per day.

The most important number is the number of queries per second. Right now, we're cruising around 1 million queries per second, and it's not uncommon to have 4, 5 or 6 million queries per second, depending on whether we are under denial-of-service attack or anomalies like the death of Michael Jackson -- that caused a big spike. In the 10 years I've been associated with VeriSign, we've added 10,000 [times] capacity, and it's a footrace to stay ahead of demand.

Read the full story at ZDNet.