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單項選擇題

How would the number 231 be expressed as a binary number?（）

A. 11011011
B. 11110011
C. 11100111
D. 11111001
E. 11010011

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單項選擇題

Which one of the binary number ranges shown below corresponds to the value of the first octet in Class B address range?（）

A. 10000000-11101111
B. 11000000-11101111
C. 10000000-10111111
D. 10000000-11111111
E. 11000000-10111111

單項選擇題

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?（）

A. 210
B. 224
C. 240
D. 248
E. 252

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