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Hardware virtual private networks (hardware VPNs) exist on single, standalone devices that contain dedicated processors, managing authentication, encryption and other VPN functions along with providing hardware firewalls.
This is a much more secure networking infrastructure than what is available in software VPN's but can be expensive in terms of installed hardware costs.
Hardware VPNs are often used in enterprise where a number of employees need network access rather than in a branch office or small business/home use as the number of users can be firewalled effectively by a single router which can provide the same network security without an expensive dedicated server.
There are many advantages to a hardware VPN but the cost of ownership has to be considered when deciding if it is an appropriate hardware solution.