# Network Infrastructure & Routing

> Master the hardware and architecture of the network. Explore switches, routers, NAT, VLANs, VPNs, and firewalls to understand how traffic is moved and secured.

Canonical: https://codelivly.com/rooms/network-infrastructure-routing
Last updated: 2026-07-01

| | |
|---|---|
| Level | Beginner |
| Category | Networking |
| Lessons | 5 |
| Estimated time | 30 min |
| XP | 200 |

You know the protocols, but how does the data actually move? The Network Infrastructure & Routing module transitions from theoretical protocols to the physical and logical hardware that powers the modern internet and corporate networks.

You will learn how switches and routers make forwarding decisions at Layer 2 and Layer 3, and how Network Address Translation (NAT) allows thousands of private devices to share a single public IP. We will dive into network segmentation using VLANs, secure remote access via VPN tunnels, and the critical role of firewalls and Access Control Lists (ACLs) in filtering malicious traffic.

By the end of this module, you will understand the physical architecture of enterprise networks, how to segment them for security, and how defenders build the perimeter to keep attackers out.

## Lessons

1. Switches & VLANs (30 min)
2. Routers & Routing Basics (30 min)
3. NAT (30 min)
4. VPNs & Secure Tunnels (30 min)
5. Firewalls & ACLs (30 min)

## Related

- [Learning path: Networking Fundamentals](https://codelivly.com/learning-paths/networking-fundamentals)
- [All rooms](https://codelivly.com/rooms)