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Is VLAN, VPN and SD-WAN part of network virtualization [closed]

Network Engineering

I have to make research about network virtualization. Here is my subject : Virtualization in networks: NFV (Network Function Virtualization), SDN (Software Defined Networks). Thank you in advance for your response

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2018 SD-WAN Survey: What Enterprises Want From Their SD-WAN Vendor

CATO Networks

SD-WAN adoption is seeing rapid growth as companies look to streamline their WAN infrastructure and move toward more cloud-based applications. Maintaining security on a network with hundreds of locations is a challenge, and a security breach could mean lost revenue and compromised client or intellectual data.

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