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Redundancy

Network redundancy ensures critical systems remain available when components inevitably fail, covering everything from power and cooling to hardware, software, and data. Building redundancy into a network is a foundational principle for maintaining consistent availability.

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About this video

Network redundancy is a foundational infrastructure principle built around the understanding that failures are not a matter of if, but when. Designing with redundancy in mind ensures that when a component does fail, operations can continue without significant disruption, preserving availability for end users and preventing costly downtime. The concept is straightforward: having a backup in place means a failure triggers a controlled recovery rather than a crisis. Redundancy applies across multiple layers of a network environment. Physical and environmental considerations include location redundancy, power supply, and cooling systems. On the technical side, redundancy extends to networking equipment, hardware, software, services, and data. Each of these areas represents a potential single point of failure that, left unaddressed, could compromise the availability of critical systems. Addressing them systematically is what separates a resilient infrastructure from a fragile one.

What you'll learn

Explain the purpose of network redundancy and identify the key areas where redundancy should be implemented to maintain system availability.

What's covered

Network Redundancy

Why Redundancy Matters
- Inevitable failures
- Maintain user availability
Spare Tire Analogy
- Backup when failure occurs
- Resume operations quickly
Areas of Redundancy
- Location and power cooling
- Networking and hardware
- Software and services
- Data

Key terms

Redundancy: The duplication of critical components or systems to increase reliability and availability.
Availability: The assurance that systems and data are accessible and operational when needed by authorized users.
Failover: The automatic switching to a redundant system or component when the primary one fails.

Topics

Network Redundancy High Availability Fault Tolerance Networking Power Redundancy Disaster Recovery

Transcript

Another core principle is redundancy. We want to make sure we have redundancy within our networks, because inevitably something is going to fail on us and we need to be prepared for that.

Redundancy is somewhat like a spare tire. Hopefully we don't need it, but if we get a flat tire, it's really helpful to have that spare tire. Otherwise we have to jump through a lot more hoops to get back on the road and get to where we're going. Having a spare tire allows us to just change out that flat tire and continue along our way.

Redundancy is going to be critical if you're trying to maintain a level of availability for your users. There are lots of areas that we will want redundancy in. We're going to get much more in depth into this in another module, but some of the aspects that we want to create redundancy in are:

location redundancy
power
cooling
networking
hardware
software and services
data

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