Network Security and Exposure

Network security and exposure management reveal another common misunderstanding in shared responsibility: a provider can secure the backbone and still leave the customer fully responsible for what the workload is allowed to expose. The customer decides segmentation, ingress rules, east-west communication patterns, third-party connectivity, and the risk posture of public-facing services.

The lessons in this chapter move from the perimeter inward. They examine private access and segmentation, firewalls and rule design, hybrid and third-party connectivity, and the layered protections that matter at the edge. Read together, they show why customer-owned exposure decisions often matter more to real risk than provider-owned backbone protections.

What This Chapter Sharpens

• the difference between provider-secured foundational networking and customer-defined workload reachability
• how hybrid and third-party connectivity create extra ownership seams that need explicit review
• why edge protection reduces some risk but does not cancel poor segmentation or overbroad access rules

Use this chapter when the networking conversation sounds secure at the infrastructure level but still feels unclear at the workload and policy level.

In this section

• Network Perimeters, Segmentation, and Private Access
  Network perimeters, segmentation, and private access are customer-owned architecture choices built on top of provider networking primitives.
• Firewalls, Security Groups, and Access Rules
  Firewalls, security groups, and access rules are one of the clearest examples of customer-owned network control.
• Hybrid Connectivity and Third-Party Integrations
  Hybrid connectivity and third-party integrations expand the trust boundary beyond one cloud account or one provider platform.
• DDoS, Edge Protections, and Layered Defense
  DDoS protections, edge controls, and layered defense show the shared responsibility model at its most nuanced.