http://www.cisco.com/c/en/us/solutions/service-provider/visual-networking-index-vni/index.html

1. Growth In the Cloud
Global Data Center Traffic is projected to more
than triple between 2015 and 2020, with cloud
traffic within data centers forecast to nearly
quadruple during that period.
Traditional
Data Center Traffic
Cloud
Data Center Traffic
By 2020, 92% of global data center
traffic will come from cloud services
and applications
2015
2020
827
EB
1.2
ZB
Total Data
Center Traffic
2015
2020
4.7 ZB
15.3 ZB
2015
2020
3.8
ZB
14.1
ZB
1 zettabyte (ZB) is equal to sextillion bytes, or a trillion gigabytes.
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