In the second annual Cisco Global Cloud Index (2011-2016) , Cisco  forecasts global data center traffic to grow fourfold and reach a total of 6.6  zettabytes annually by 2016. The company also predicts global cloud traffic, the  fastest-growing component of data center traffic, to grow sixfold – a 44 percent  combined annual growth rate (CAGR) – from 683 exabytes of annual traffic in 2011  to 4.3 zettabytes by 2016.    For context, 6.6 zettabytes is equivalent to:   92 trillion hours of streaming music  – Equivalent to about 1.5 years  of continuous music streaming for the world's population in 2016.   16 trillion hours of business Web conferencing – Equivalent to about  12 hours of daily Web conferencing for the world's workforce in 2016.   7 trillion hours of online high-definition (HD) video streaming  –  Equivalent to about 2.5 hours of daily streamed HD video for the world's  population in 2016.    The vast majority of the data center traffic is not caused by end  use...
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