Networking
VPC, Route 53, CloudFront, load balancers, and connectivity services. Understand subnets, security groups, peering, and content delivery — the plumbing of AWS architectures.
API Gateway WebSocket API: Real-Time Apps Made Easy
API Gateway WebSocket API is a managed AWS service for persistent, bidirectional communication. Simplify real-time apps with Lambda. Learn when to use it.
API Gateway REST vs HTTP: How It Works & When to Use It
Amazon API Gateway offers REST APIs and HTTP APIs. Understand their differences, features, and pricing to choose the right one for your needs. Learn when to choose it.
AWS Global Accelerator: Improve App Performance & Availability
AWS Global Accelerator improves application availability and performance for users worldwide. Get static IPs, optimize traffic routing. Learn when to use it.
CloudFront OAC: How It Works & When to Use It
CloudFront Origin Access Control (OAC) restricts S3 bucket access to CloudFront distributions. Learn how it enhances security and when to use it.
AWS Data Transfer Costs: The Hidden Bill Explained (2026 Guide)
AWS data transfer pricing decoded: internet egress, cross-AZ, cross-region, NAT Gateway, VPC peering, CloudFront, and public IPv4. Avoid surprise bills with this guide.
CloudFront Signed URLs: Secure Private Content Access
CloudFront Signed URLs provide temporary, secure access to private content via CloudFront CDN. Protect paid media, docs, or downloads. Learn how to use them.
Route 53 Health Checks: How It Works & When to Use It
Amazon Route 53 Health Checks monitor application endpoints for health and availability, enabling automated DNS failover. Learn how they work and when to use them.
Route 53 Routing Policies: How It Works & Use Cases
Route 53 Routing Policies are rules that control DNS query responses, directing traffic for high availability and low latency. Learn when to use them.
Elastic Network Interface (ENI): How It Works & When to Use It
An Elastic Network Interface (ENI) is a virtual network card in AWS VPC for EC2 instance connectivity. Learn its definition, features, and use cases.
Elastic IP Address: How It Works & When to Use It
An Elastic IP Address (EIP) is a static, public IPv4 address for your AWS account. It remains persistent, unlike standard IPs. Learn when to use it.
VPC Route Table: How It Works & When to Use It
A VPC Route Table directs network traffic from your subnets. Learn how it acts as a virtual router for your Amazon VPC and when to use it.
VPC Flow Logs: How It Works & When to Use It
VPC Flow Logs captures IP traffic metadata for your AWS VPC. Monitor network connectivity, troubleshoot security, and analyze traffic. Learn how it works and when to use it.
VPC Endpoint: Secure Private AWS Service Connections
A VPC Endpoint connects your VPC to AWS services privately, without the public internet. Enhance security and simplify management. Learn how it works.
AWS PrivateLink: Secure Private Connectivity Explained
AWS PrivateLink offers secure, private connectivity between VPCs, AWS services, and on-premises networks. Keep traffic off the public internet. Learn how it works.
AWS Client VPN: Secure Remote Access to AWS & On-Prem
AWS Client VPN is a managed VPN service for secure remote access to AWS and on-premises networks. Learn how it works and when to use it.
AWS Site-to-Site VPN: Securely Connect On-Premises to AWS
AWS Site-to-Site VPN creates secure, encrypted connections between your data center and AWS VPCs. Learn how it works and when to use it.
VPC Peering: Direct Private Connections Between VPCs
VPC Peering connects two VPCs privately, allowing resources to communicate via private IPs. Learn how it works and when to use it.
NAT Gateway vs NAT Instance: How It Works & When to Use It
NAT Gateway vs NAT Instance: Secure outbound internet access for private EC2 instances. Learn key differences, use cases, and when to choose each.
Internet Gateway (IGW): How It Works & When to Use It
An AWS Internet Gateway (IGW) connects your VPC to the internet. Learn its definition, role in route tables, and how EC2 instances use it. See examples and limits.
Elastic Load Balancing (ELB): How It Works & When to Use It
Amazon ELB distributes traffic across targets like EC2 instances & Lambda. Learn what it is, how it works, and when to use this AWS networking service.
Amazon VPC: Subnets, Gateways & Networking Explained
Amazon VPC is a logically isolated AWS network. Learn subnets, route tables, internet gateway vs NAT gateway, security groups vs NACLs, peering, and exam tips.
AWS Transit Gateway: VPC Hub for Hybrid Networking
AWS Transit Gateway is a regional hub connecting VPCs, VPNs, and Direct Connect. Learn transitive routing, 5000 attachments, multicast, cross-Region peering, and exam tips.
VPC Subnet: Public vs Private Subnets in AWS Explained
A VPC subnet is a CIDR range inside a VPC pinned to one AZ. Learn public vs private subnets, route tables, the 5 reserved IPs, IPv6 /64 subnets, and exam tips for SAA-C03.
AWS Security Group: Stateful Instance-Level Firewall Guide
AWS Security Groups are stateful, instance-level firewalls with allow-only rules. Learn inbound/outbound rules, SG references, the 60-rule limit, and exam tips for SAA-C03.
Security Group vs NACL: AWS Firewall Comparison Guide
Compare AWS Security Groups vs Network ACLs: stateful vs stateless, instance vs subnet, allow-only vs allow+deny, SG references vs CIDR only, and defense-in-depth patterns.
Amazon Route 53: DNS, Routing Policies & Health Checks
Amazon Route 53 is AWS's DNS service with 100% availability SLA. Learn routing policies (Simple, Weighted, Latency, Failover, Geo), health checks, alias records, and domain registration.
AWS Network Load Balancer (NLB): Layer 4 Load Balancing
AWS Network Load Balancer is a Layer 4 TCP/UDP/TLS load balancer with static IPs, millions of RPS, source-IP preservation, and PrivateLink support. Learn pricing.
AWS NAT Gateway: Private Subnet Internet Access Guide
AWS NAT Gateway enables outbound internet access for private subnets. Learn 45 Gbps throughput, 55K connections per destination, public vs private NAT, and pricing.
AWS Network ACL (NACL): Stateless Subnet-Level Firewall
AWS Network ACLs are stateless, subnet-level firewalls supporting allow and deny rules evaluated in numerical order. Learn ephemeral ports and exam tips.
AWS Direct Connect: Dedicated Fiber for Hybrid Cloud
AWS Direct Connect provides private fiber to AWS from 50 Mbps to 100 Gbps. Learn Virtual Interfaces, Direct Connect Gateway, LAG for HA, pricing, and exam tips.
Amazon CloudFront: AWS CDN, Edge Locations & Pricing
Amazon CloudFront is AWS's CDN with 600+ edge locations. Learn distributions, origins, cache behaviors, OAC, signed URLs, CloudFront Functions vs Lambda@Edge, and pricing.
Amazon API Gateway: REST, HTTP & WebSocket APIs on AWS
Amazon API Gateway is AWS's managed API service. Learn REST vs HTTP vs WebSocket APIs, integrations with Lambda, auth (IAM, Cognito, Lambda authorizers), throttling, and pricing.
AWS Application Load Balancer (ALB): Layer 7 Routing Guide
AWS Application Load Balancer is a Layer 7 HTTP/HTTPS load balancer with host/path routing, WAF, Cognito auth, and Lambda targets. Learn features, pricing, and exam tips.
ALB vs NLB: When to Use Each AWS Load Balancer
Compare AWS Application Load Balancer (ALB, Layer 7) vs Network Load Balancer (NLB, Layer 4): routing, protocols, latency, static IPs, source IP preservation, and pricing.