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?（）

单项选择题 The subnet mask on the serial interface of a router is expressed in binary as 11111000 for the last octet. How do you express the binary number 11111000 in decimal?（）

多项选择题 You have the binary number 10011101. Convert it to its decimal and hexadecimal equivalents.（）