Explain how the OSI model can be used to help understand network segmentation.
What will be an ideal response?
One of the best tools to help us understand network segmentation is the OSI seven-layer model, in particular the first three layers:
Layer 1 (Physical) Physically separating your network from every other network. This is also known as an air gap.
Layer 2 (Data Link) Separating a physically connected network into separate broadcast domains. Think VLANs here.
Layer 3 (Network) Separating broadcast domains by using different subnets or blocking IP routes.
Above Layer 3 VPNs, separate SSIDs, separate Windows domains, virtualization.
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