Performance, Security, Compliance
. Separate switches, separate server racks - no chance of data mixing (think of the customer A and customer B examples) but requires a lot of wastes switches and physical space
. Use VLANS for same purpose, but can all use the same switch - still can't communicate with each other and would require a router to communicate with each other
. Segment your network with no physical devices at all. Beyond physical segmentation where things are physically apart from each other, no chance of communicating with each other; highly secure environments. Think of a corporate network with 2 separate physical sites - each site having a VPN concentrator
. Remote access VPNs - like we normally use when working remote at home or a hotel
. All software based VPN - doesn't use a VPN concentrator device
. Just the protocol used to enable VPNs
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