Back in 2013, CenturyLink was a regional voice and internet provider. Not exactly the most likely candidate to be an early pioneer in NFV. But at that point, the company wanted to launch a network firewall system. And it turned out that the best business case for the new offering was a virtualized firewall. This paved the way for CenturyLink to adopt other network virtualization services, making the phone company a leader in SDN and NFV. Since then, CenturyLink has purchased Level 3, which also had network virtualization experience. And the combined company now offers global business services, such as SD-WAN.
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