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title: “Learnings — Networking” created: 2026-07-20 updated: 2026-10-28 type: knowledge tags:

  • aws
  • certification
  • networking

Networking

Atomic notes on AWS networking — VPC, Route53, CloudFront, Direct Connect, ELB.

Notes

VPC

  • [[vpc-fundamentals]] — What a VPC is, isolation, core components, CIDR constraints
  • [[vpc-subnets]] — Public vs private subnets, AZ constraint, reserved IPs
  • [[vpc-route-tables]] — Route evaluation logic, local route, public vs private routing
  • [[vpc-internet-gateway]] — IGW characteristics, requirements for Internet access
  • [[vpc-nat-gateway]] — Outbound-only connectivity for private subnets, deployment options
  • [[vpc-network-acls]] — Stateless firewall at subnet level, rule evaluation order
  • [[vpc-security-groups]] — Stateful firewall at instance level, default SG behavior

IP Addressing

  • [[cidr-notation]] — CIDR notation explained (IP ranges, prefix length, subnets)

DNS / Route 53

  • [[route53-alias-vs-cname]] — Alias vs CNAME and the apex rule (exam trap)

Applied

  • [[deploy-custom-domain-route53-acm-cloudfront]] — runbook: register a domain in Route 53, ACM cert, attach to CloudFront, apex Alias (the alias-vs-CNAME theory put into practice for mimifasol.com)