# Site-to-Site and Remote Access VPNs

> Master VPN architectures including IPsec site-to-site tunnels and SSL/TLS remote access. Learn to configure, secure, and exploit enterprise VPN infrastructure.

Canonical: https://codelivly.com/rooms/site-to-site-and-remote-access-vpns
Last updated: 2026-09-04

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

Virtual Private Networks (VPNs) are the cryptographic lifelines that connect distributed offices and remote workers to enterprise resources. This module explores the two primary VPN architectures: site-to-site VPNs that securely link entire networks via IPsec tunnels, and remote access VPNs that provide individual users with secure connectivity via SSL/TLS or IKEv2. You will learn the mechanics of tunnel mode vs transport mode, split tunneling vs full tunneling, and the critical security differences between these architectures. Furthermore, you will discover how attackers exploit weak pre-shared keys, misconfigured split tunneling, and authentication bypasses to compromise VPN infrastructure, and how to implement defensive controls like certificate-based authentication, multi-factor authentication, and strict access policies to harden your VPN deployments.

## Lessons

1. What Is a VPN and Why Does It Matter (30 min)
2. IPsec Fundamentals (30 min)
3. Configuring a Site-to-Site IPsec VPN (30 min)
4. SSL/TLS Remote Access VPNs (30 min)
5. Guided Lab: Building a Site-to-Site VPN Tunnel (30 min)

## Related

- [Learning path: WAN, VPN and Cloud Networking](https://codelivly.com/learning-paths/wan-vpn-and-cloud-networking)
- [All rooms](https://codelivly.com/rooms)