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Historically, the ideal network security architecture has been a wall. The mindset has been to keep everything out so that what is inside cannot be compromised.
The problem with this is that we make mistakes.
Statistically, there is a 1 in 4 chance that someone will, intentionally or not, open the wall, and the resulting breach and loss of critical information will damage your business.
Microsegmentation builds a ship instead of a wall. If a ship’s hull is breached, the water flows into a secure compartment (or segment), but no further.
This webcast gives a technical explanation of microsegmentation and why software-defined security is the best option overall.