Answers to Practice Problem 9 (From Table 12-5)
The last problem with IP address 223.223.0.1 is that it’s near the high end of the Class C range. As a result, only the last (host) octet is changed to 0 to form the network ID 223.223.0.0. It looks a little like a Class B network number at first glance, because it ends in two octets of 0. However, it is indeed a Class C network ID (based on the value in the first octet).
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