Which technology provides flexible network isolation without the constraints of physical hardware in a cloud infrastructure?

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Which technology provides flexible network isolation without the constraints of physical hardware in a cloud infrastructure?

SaaS
SDN
IaaS
PaaS

Explanation: Software-defined networks (SDN) enable new types of security controls and provide an overall gain for network security including:

Easy network isolation without constraints of physical hardware
SDN firewalls (security groups in cloud computing) applied to assets based on more flexible criteria than hardware firewalls

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