Design well-architected networks on AWS (NET202)

Here is a detailed summary of the key takeaways from the video transcription, broken down into sections:

Planning and Sizing

  • Plan your account structure, VPC structure, and IP addressing (both IPv4 and IPv6) to accommodate current and future needs
  • Avoid IP address overlaps between VPCs
  • Define expectations for connectivity to on-premises data centers and design accordingly

VPC Connectivity

  • Use Transit Gateway and AWS Cloud WAN for the bulk of your cross-VPC connectivity needs
  • Utilize other services like Private Link, VPC Lattice, and Resource Endpoints for specific use cases
  • Understand the trade-offs between different connectivity options (e.g., latency, cost, isolation)

DNS

  • Leverage the default VPC DNS resolver or Route 53 resolver unless you have specific requirements
  • Use Route 53 profiles to maintain consistent DNS configuration across your organization
  • Implement hybrid DNS resolution between on-premises and AWS environments

Security

  • Use security groups as the primary firewall mechanism within VPCs
  • Implement additional network-level security controls (e.g., Network Firewall, Web Application Firewall) at the VPC boundary
  • Consider a layered security approach, leveraging different AWS services for different use cases

Traffic Inspection

  • Evaluate centralized vs. decentralized patterns for east-west and egress/ingress traffic inspection
  • Utilize services like Gateway Load Balancer, AWS Network Firewall, and AWS Shield for traffic inspection and DDoS mitigation

Infrastructure as Code

  • Use Infrastructure as Code (IaC) tools to create reusable patterns and templates for your VPC deployments
  • Separate concerns (e.g., shared services, workload VPCs) into modular stacks for better maintainability

Key Recommendations

  • Plan thoroughly, considering both current and future requirements
  • Leverage AWS-managed services and constructs where possible to simplify operations
  • Implement a consistent, scalable, and secure networking architecture using AWS best practices
  • Automate your networking infrastructure deployment and configuration management

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