单项选择题
The MAC address for your PC NIC is: C9-3F-32-B4-DC-19. What is the address of the OUI portion of this NIC card, expressed as a binary number?（）
A.11001100-00111111-00011000 B.11000110-11000000-00011111 C.11001110-00011111-01100000 D.11001001-00111111-00110010 E.11001100-01111000-00011000 F.11111000-01100111-00011001
单项选择题 How would the number 172 be expressed in binary form?（）
单项选择题 How would the number 231 be expressed as a binary number?（）
单项选择题 Which one of the binary number ranges shown below corresponds to the value of the first octet in Class B address range?（）
