Exam 200-150 topic 1 question 71 discussion

You first convert each octet to binary. Each octet is 8 bits, and each bit has a numeric value associated with it: 128 64 32 16 8 4 2 1 Start by determining the highest number (from above) that will fit into 172 and subtract that from 172. Place a "1" under that position: 172 - 128 = 44 remainder 128 64 32 16 8 4 2 1 1 x x x x x x x Now find the highest number that will go into 44: 44 - 32 = 12 128 64 32 16 8 4 2 1 1 0 1 x x x x x x Keep doing this process and you end up with 10101100 Split these 8 bits into two nibbles (4 bits) and convert each to hex: 1010 = 10 decimal or hex A 1100 = 12 decimal or hex C So the first octet is AC. Only one answer starts with AC, so that's your answer.