Google will confront the U.S. government's latest attempt to topple its internet empire in federal court on Friday as a judge considers how to prevent the abusive tactics that culminated in parts of its digital ad network being branded as an illegal monopoly.

The courtroom showdown in Alexandria, Virginia, will pit lawyers from Google and the U.S. Department of Justice against each other in closing proceedings focused on the complex technology that distributes millions of digital ads across the internet each day.