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.
Cost of money refers to the average interest rate at which you are able to borrow money. Think of the cost of money as the rent you have to pay for using someone else's money. Yes, there is a cost of money even if you are using all of your own money.