Actually unmetered bandwidth means that you get a specific port for your server like we give 10mbps port unmetered bandwidth with our every server which is upgradeable to 100mbps port. Now this means is that your bandwidth is not measured on traffic but your server can always use 100mbps port.

In metered bandwidth like of 2000 gb or 3000 gb bandwidth is measured on your traffic, like if your server requires more connections than 10mbps port your server can automatically use it however in unmetered it can not.

So in unmetered bandwidth traffic is not measured but in metered bandwidth you have the advantage of using port speed whatever your server required by you will have to pay for any extra bandwidth usage in this way ..