Traditional perimeter-based security models create a "hard shell, soft center" approach where:
Trust is based on network location (inside = trusted, outside = untrusted)
Security controls focus on the network perimeter
Internal traffic is largely unmonitored
VPNs provide broad network access once authenticated Zero-Trust eliminates the concept of trusted networks by:
Treating all networks as untrusted, including internal ones
Authenticating and authorizing every connection attempt
Implementing microsegmentation to limit lateral movement
Continuously monitoring all network traffic and user behavior
Providing conditional access based on risk assessment This shift addresses modern threats like insider attacks, compromised credentials, and advanced persistent threats that traditional perimeter defenses struggle to detect.
Rewriting in plainer words…
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