We have a Branch office with 100-150 Employees, for some reason Fortigate model 81E was purchased but not used yet, do you think that model can support that amount of users knowing that there are ~30 printers and servers?
This varies much more from the type of traffic than from the number of users.
It follows the equipment datasheet so that you can compare it with the current reality. It is very important to validate the number of packages, and the type of firewall usage, that is, which features will be activated.
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