
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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In this chapter, you explored the critical components of VPC security in AWS, including NACLs and security groups. Both are essential for managing and securing network access at different layers within your VPC. NACLs provide stateless, subnet-level security by filtering traffic based on sequential rule evaluation, while security groups, operating at the instance level, offer stateful access control with rules that allow dynamic traffic management.
This chapter highlighted best practices for configuring both NACLs and security groups, such as maintaining bidirectional rules for stateless NACLs, rule sequencing for accurate filtering, and using security group references to enable more secure application segmentation. You also reviewed internet gateways, NAT gateways, and egress-only internet gateways, understanding their roles in providing and securing external connectivity.
With this knowledge of VPC security fundamentals, you are well-prepared to design and manage secure...