Redundancy requires independent paths

Redundancy requires independent paths.

A major U.S. air traffic disruption on Monday exposed this principle.

The primary communications circuit at an FAA facility failed. When operations moved to the backup connection, teams discovered the backup fiber line had been severed during construction.

Controllers lost radar and communications for hours.

About 9,500 flights were delayed or canceled, with major effects across the Northeast.

The incident was not a cyberattack.

Security, networking, and data-center leaders should still pay attention.

Two connections do not provide resilience when both share the same physical route, provider, facility, power source, or control plane.

This creates hidden concentration risk.

The same issue exists across enterprise infrastructure:

• Primary and backup circuits entering through the same conduit
• Redundant systems operating within one facility
• Multiple applications depending on one identity platform
• Separate cloud workloads using the same region
• Backup data accessible through production credentials
• AI clusters sharing network, storage, cooling, and power dependencies
• Recovery systems managed through the same compromised control plane

A resilient architecture must separate failure domains across:

• Physical routes
• Network providers
• Geographic locations
• Power sources
• Management systems
• Security controls
• Identity credentials
• Operational teams

Testing also matters.

A backup connection shown as available on a dashboard provides limited assurance. Teams need controlled failover exercises proving critical services remain operational after the primary path disappears.

The new air traffic control architecture reportedly aims to remove single and dual points of failure through multiple telecommunications routes.

Every organization operating critical digital infrastructure should apply the same principle.

My takeawayresilience is not the number of backup components.

Resilience is the ability to continue operating when several connected assumptions fail at the same time.

Do your backup systems provide true independence, or do they share the same hidden failure point?