Chapter 15
1. C. Thinking about the conversion one octet at a time, the first two octets each convert to 8 binary 1s. 254 converts to 8-bit binary 11111110, and decimal 0 converts to 8-bit binary 00000000. So, the total number of binary 1s (which defines the prefix length) is 8+8+7+0 = /23.
2. B. Thinking about the conversion one octet at a time, the first three octets each convert to 8 binary 1s. 240 converts to 8-bit binary 11110000, so the total number of binary 1s (which defines the prefix length) is 8+8+8+4 = /28.
3. C. /24 is the equivalent of the mask that in binary has 24 binary 1s. To convert that to DDN format, write down all the binary 1s (24 in this case), followed by binary 0s for the remainder of the 32-bit mask. Then take 8 bits ...
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