1 Click Refresh Events. New events are added to the list, and unknown traffic events return to the list if they have not been resolved.  You can also test resolving unknown traffic events by clicking My Dashboards > NetFlow > NTA Summary. You should no longer see a banner regarding unknown flow traffic.
An implicit interest rate is the nominal interest rate implied by borrowing a fixed amount of money and returning a different amount of money in the future.
The opportunity cost of an activity. Implicit costs are what a company or individual could have earned had a different decision been made. For example, suppose an independent consultant has two clients and she spends some time working on the first client's project.