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Gates. Alarm systems. Security guards. What do they all have in common? They are the first line of defense protecting what is most important to you. If an attacker were to get past that guard, would you still be protected?
In the Information Security community, we use what is called a defense-in-depth, or layered, approach. This means that if one aspect of our defense fails, there are many others to fall back on. We call this eliminating a single point of failure.
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