Hey, i'm making a test for cisco (CCNA01), but im at a question where i have to calculate subnets. But im not sure how to do this. The question is as follows: A company with a Class B license needs to have a minimum of 1000 subnets with each subnet capable of accommodating 50 hosts. Which mask below is the appropriate one? A - 255.255.0.0 B - 255.255.240.0 C - 255.255.255.0 D - 255.255.255.192 E - 255.255.255.224 I know the answer is D (255.255.255.192), but i would really like to know how i could find out why D is the correct answer. Could someone please help me out with the calculations. Thanks for any help.