Assignment Questions:Research DNS poisoning online. List a case (other than than ones mentioned in the textbook), where DNS poisoning took place. Which network was poisoned, who were the victims, and how did hackers exploit the poisoned system? Could this exploit have been stopped? How? Whose responsibility is it to stop these kinds of attacks?Instructions: Please review Chapters 16 & 17 of your textbook. Please submit your assignment as a MS Word document by 23:59 EST Day 5 (Friday) of Week 7. Your assignment must be submitted on or prior to the time and date that it is due, unless prior arrangements have been made with the instructor. Your submission must be of approximately 1000 words. Any external work that you refer to must be cited using the APA format (Links to an external site.). Your submission must be original and the product of your scholarship – submissions will be checked using a plagiarism checking software.Grading Rubric: The Written Assignment Grading Rubric outlined in the syllabus (Page 8) will be used for grading.