Harefield Stationers, a small office-supplies and print shop, learns that one antivirus is not 'covered': on the left a single shield lets a threat slip through its gap. In the centre its defences are drawn as five nested layers around what matters most — the customer data — keep threats out, lock things down, notice trouble, limit the damage and be able to recover; a threat gets past the first two layers but the third catches it, because if one layer fails the next holds. On the right, the layers listed with what each one is, people counted as a layer, and the reminder that a layer only counts if it is kept up.

CY-BEGINNER-081Beginner · Cybersecurity Foundations

The Layers — Why One Defence Is Never Enough

No single defence is perfect, so you use several — layers — and if one fails, the next holds. Learn to stack different kinds of layer, put the most around what matters most, count your people as a layer, distrust any single defence, and keep every layer working.

11 hours8 chapters32 lessons225 activities8 labs

What you'll learn

Understand why no single defence is perfect, so relying on one is relying on it never failing, and why the answer is layers.
Grasp 'if one fails, the next holds', and build different kinds of layer that catch what the others miss.
Count alert people as one of your strongest layers, and put the most protection around what matters most.
Spot the 'we've got X, so we're covered' trap, ask 'what's behind it?', and keep every layer working.

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