Google, already facing a possible breakup of the company over its ubiquitous search engine, is fighting to beat back another attack by the US Department of Justice alleging monopolistic conduct, this time over technology that puts online advertising in front of consumers. The Justice Department and Google are scheduled to make closing arguments Monday in a trial alleging Google's advertising technology constitutes an illegal monopoly. US District Judge Leonie Brinkema in Alexandria, Virginia, will decide the case and is expected to issue a written ruling by the end of the year. If Brinkema finds Google has engaged in illegal, monopolistic conduct, she will then hold further hearings to explore what remedies should be imposed. The Justice Department, along with a coalition of states, has already said it believes Google should be forced to sell off its ad tech business, which generates tens of billions of dollars annually for the Mountain View, California-based company. After roughly