List some devices that can form the endpoints of the VPN.
What will be an ideal response?
A server running VPN protocols (e.g., IPSec)
A VPN appliance, which is a special hardware device devoted to setting up VPN communications
A firewall/VPN combination: Many high-end firewall programs support VPN setups as part of their built-in features.
A router-based VPN: Routers that support IPSec can be set up at the perimeter of the LANs to be connected. These are also sometimes called IPSec concentrators. IPSec concentrators use a complex set of security protocols to protect information, including Internet Key Exchange (IKE), which provides for the exchange of security keys between the machines in the VPN.
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