CHO 10.0.0.0/20 . HỎI SUBNET MASKC. 255.255.255.240A. 255.255.260....

24. Cho 10.0.0.0/20 . Hỏi subnet maskc. 255.255.255.240a. 255.255.260.0d. 255.255.255.224b. 255.255.240.0