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Amazon VPC (Virtual Private Cloud) is the networking backbone of every AWS architecture — and one of the most complex topics on SAA-C03, SAP-C02, and the Advanced Networking Specialty (ANS-C01). Nearly every exam question involving multi-tier applications, security isolation, hybrid connectivity, or high availability touches VPC concepts.
The VPC service cheat sheet covers the fundamentals: CIDR block sizing, public vs private subnets, Internet Gateway vs NAT Gateway vs NAT Instance, route table rules, security groups (stateful) vs NACLs (stateless), VPC endpoints (Gateway vs Interface/PrivateLink), and DNS resolution settings. It also covers the key limits: 5 VPCs per region by default, 200 subnets per VPC, and the implications of non-overlapping CIDR blocks for peering.
The networking comparison sheets resolve the hardest VPC architecture decisions. VPC Peering vs Transit Gateway vs PrivateLink is the definitive guide to inter-VPC connectivity — when peering works (small number of VPCs, no transitive routing needed), when Transit Gateway is required (hub-and-spoke at scale), and when PrivateLink is the right choice (exposing a service without exposing the VPC). Security Groups vs NACLs clarifies the stateful vs stateless distinction that appears on virtually every networking question.
For hybrid connectivity, the Direct Connect vs VPN vs Internet comparison covers bandwidth, latency, cost, and reliability trade-offs. These scenarios are heavily tested on SAP-C02 and ANS-C01 — understanding when to use Direct Connect (consistent bandwidth, private connectivity) vs Site-to-Site VPN (encrypted overlay, lower cost) vs Transit Gateway with multiple attachments is essential.
The VPC Networking Fundamentals architecture guide ties everything together — CIDR planning for multi-region deployments, Transit Gateway route domains, PrivateLink design patterns, and the security architecture of a well-designed multi-tier VPC with public, private, and isolated subnet tiers.
Amazon VPC: The Network Foundation of AWS
Isolate, secure, and connect your AWS resources with full network control — the backbone of every AWS architecture.
AWS Transit Gateway: The Cloud Network Hub
One gateway to connect thousands of VPCs, on-premises networks, and AWS services — at scale.
AWS Direct Connect: The Private Highway to the Cloud
Dedicated, consistent, low-latency private network connectivity between your data center and AWS — bypassing the public internet entirely.
VPC Peering vs Transit Gateway vs PrivateLink: The Definitive AWS Networking Comparison
Stop guessing which to use — master the decision framework that separates passing candidates from failing ones
Security Groups vs NACLs: The Definitive Network Defense Comparison
Master stateful vs stateless firewall logic — the concept that separates passing candidates from failing ones
Direct Connect vs VPN vs Internet: The Definitive Connectivity Showdown
Choose the right AWS network path — performance, security, cost, and compliance decoded
CloudFront vs Global Accelerator: The Definitive Edge Networking Showdown
Cache it or accelerate it — know exactly which AWS edge service to reach for and why
VPC Networking Fundamentals: The Complete Architect's Blueprint
Master AWS virtual networking from CIDR to connectivity — pass every cert question with confidence
Hybrid Connectivity Patterns: Bridging On-Premises to AWS Like a Pro
Master every pattern for connecting your data center to AWS — and never miss an exam question about it.