software-defined-networking

## What I do - Implement SDN principles and architectures - Deploy network programmability - Configure SDN controllers - Design overlay networks - Implement network virtualization - Manage network policies through software ## When to use me Use me when: - Modernizing network infrastructure - Implementing network automation - Building private cloud networks - Creating multi-tenant environments - Requiring dynamic network configuration ## Key Concepts ### SDN Benefits - **Centralized Control**: Single view of network - **Programmability**: API-driven configuration - **Agility**: Rapid service deployment - **Cost**: Reduced hardware dependency - **Automation**: Reduced manual tasks ### Overlay vs Underlay - **Underlay**: Physical network (switches, routers) - **Overlay**: Virtual network on top (VXLAN, NVGRE) ``` Physical Network (Underlay) │ │ +──────────────────────┐ │ │ VXLAN Tunnel │ │ │ (Overlay Network) │ │ │ Tenant A │ Tenant B│ │ └──────────────────────┘ ▼ VM A ──────────────── VM B ``` ### Network Virtualization - VXLAN: MAC in UDP encapsulation - NVGRE: GRE encapsulation - Geneve: Flexible encapsulation - STT: Stateless tunnel transport