High-Performing and Scalable Networks

Bundled into the existing AWS Certified Solutions Architect – Associate premium course — no separate purchase.

Included in this chapter:

LB	Layer	Protocols	Targets	Best for
ALB	L7 (HTTP/HTTPS)	HTTP, HTTPS, gRPC, WebSocket	EC2, IP, Lambda, ECS	Web / API; path + host routing
NLB	L4 (TCP/UDP)	TCP, UDP, TLS	EC2, IP, ALB	Ultra-low latency; static IPs; source-IP preservation
CLB (legacy)	L4/L7	HTTP, HTTPS, TCP	EC2 classic	Don't use for new designs
GWLB	L3 (IP)	IP (inline transparent)	Network appliances	Inline firewall / IDS / IPS

Cheat sheet

CloudFront for HTTP global; Global Accelerator for non-HTTP / static anycast
Many-VPC: Transit Gateway > peering > Direct Connect Gateway
Load balancer choice: L4 vs L7 vs static IP
CloudFront origins: not just S3 + EC2
Transit Gateway: per-hour-per-attachment + per-GB processed
ALB target groups can be IPs, Lambdas, or instances
Route 53 latency-based routing measures from EDGE locations
CloudFront Functions vs Lambda@Edge — pick by complexity
Global Accelerator: traffic dials + endpoint weights
API Gateway: REST vs HTTP vs WebSocket
CloudFront Origin Shield adds a centralized cache layer to consolidate origin requests
Route 53 multivalue answer returns up to eight healthy IPs from associated health checks
Route 53 Evaluate Target Health propagates ELB health into DNS failover
S3 Transfer Acceleration is for UPLOADS, not cost

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Cheat sheet