Since performance is also a factor in availability, load balancing may also be a requirement in building a highly available VPN.
As with all highly available solutions, a balance must be made between the level of availability required and the cost of implementing the solution. The cost could be monetary, but it could also take the form of slower performance, user inconvenience, implementation downtime, or in some other way. Each of these forms can also be expressed in terms of money, of course.
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