The ability to apply ACL and other security controls at the switch level makes VLAN the most secure type of backbone.
What is a backbone architecture?
The backbone architecture describes how the backbone connects the networks that are connected to it and controls how packets from one network go across the backbone to other networks.
The backbone component known as the distribution layer that links the LANs together. The core layer joins many backbone networks, frequently between structures.
Because each segment of the network connected to the backbone has its own subnet addresses that can be managed individually, a routed backbone provides the main benefit of clearly segmenting each component of the network connected to it.
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