# Network Redundancy Protocols

> Master HSRP, VRRP, and GLBP to ensure high availability and secure network redundancy against failover and MITM attacks.

Canonical: https://codelivly.com/rooms/network-redundancy-protocols
Last updated: 2026-09-03

| | |
|---|---|
| Level | Intermediate |
| Category | Networking |
| Lessons | 4 |
| Estimated time | 30 min |
| XP | 200 |

Dive into network redundancy protocols like HSRP, VRRP, and GLBP. Learn how first-hop redundancy works, how to configure high availability, and how attackers exploit misconfigured redundancy protocols for MITM and DoS attacks. Essential for network defenders and red teamers. You will master the under-the-hood election mechanics, virtual MAC addressing, and preemption behaviors that govern these protocols. Furthermore, you will learn to implement robust cryptographic authentication and deploy layer-2 security controls to neutralize spoofing attempts. By the end of this module, you will be equipped to architect resilient networks and hunt for hidden gateway hijacking vulnerabilities.

## Lessons

1. What Is First-Hop Redundancy and Why Does It Matter (30 min)
2. HSRP Configuration & Operation (30 min)
3. VRRP vs HSRP vs GLBP (30 min)
4. Guided Lab: Configuring HSRP for Gateway Redundancy (30 min)

## Related

- [Learning path: Network Design and Architecture](https://codelivly.com/learning-paths/network-design-and-architecture)
- [All rooms](https://codelivly.com/rooms)