What is redundancy in a small network and why is it important?

Redundancy means duplicate equipment and/or duplicate links so the network has no single point of failure, maintaining reliability if a device or path fails.

A single point of failure is any one component whose death takes the whole network down with it — one switch every host hangs off, or the only link to the internet. Redundancy attacks that risk by duplicating the critical parts so a backup can take over: a second link gives an alternate path if the first is cut, a second router or switch keeps forwarding if its twin fails, and a redundant server keeps a service alive if one box dies. The trade-off is cost, which is why even a small network doesn't duplicate everything — it identifies the few critical areas where an outage would actually hurt the business and protects those. Reliability, in other words, is bought deliberately at the points that matter, not sprinkled everywhere.

Key Benefit: Redundancy helps to eliminate single points of failure.

How to implement redundancy:

Methods:

• Installing duplicate equipment
• Supplying duplicate network links for critical areas

Key insight: Even in small networks, critical systems should have backup paths and devices to ensure business continuity.

Go deeper:

• Wikipedia — Redundancy (engineering) — the general principle of duplicating critical components to remove single points of failure.