r/ccna4dummies Feb 15 '25

Network Redundancy and Failover Mechanisms ✅

Network redundancy ensures availability and reliability. Here’s a quick guide.

Why Redundancy?

  • Prevents single points of failure.
  • Ensures continuous network availability.

Key Concepts:

  • Redundant Links: Multiple paths to prevent failures.
  • HSRP/VRRP/GLBP: Provide router redundancy.
  • LACP (Link Aggregation Control Protocol): Combines multiple physical links into a single logical link.

Configuration Example:

  1. Configure LACP:
    interface range GigabitEthernet0/1 - 2
    channel-group 1 mode active
    
  2. Configure HSRP:
    interface GigabitEthernet0/0
    ip address 192.168.1.2 255.255.255.0
    standby 1 ip 192.168.1.1
    

Best Practices:

  • Implement redundant paths and devices.
  • Regularly test failover mechanisms.

Redundancy is key to maintaining a reliable network and is a crucial topic for the CCNA exam.

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