Cloud Network Security

Cloud computing has fundamentally changed network security architecture. The traditional perimeter dissolves when applications, data, and users are distributed across multiple cloud providers, on-premises data centres, and remote locations. Cloud network security requires adapting architectural principles to environments where you no longer control the physical infrastructure.

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How Cloud Changes Network Security

Traditional	Cloud
Physical firewalls at the perimeter	Virtual firewalls and security groups
Hardware load balancers	Cloud-native load balancers
Physical network segmentation	Virtual networks and subnets
On-premises IDS/IPS	Cloud-native threat detection services
MPLS for site-to-site connectivity	VPN and SD-WAN over the internet
Capital expenditure (buy hardware)	Operational expenditure (pay as you go)

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Shared Responsibility Model

Cloud security follows a shared responsibility model — the cloud provider secures the infrastructure, while the customer secures their workloads: