Answers to Practice Problem 8 (from Table 12-5)
The first octet of problem 8 (191.255.1.47) sits on the upper edge of the Class B range for
the first octet (128–191). As such, to find the network ID, change the last two octets (host
octets) to 0, for a network ID of 191.255.0.0. This value sometimes gives people problems
because they are used to thinking that 255 somehow means the number is a broadcast
address.
The broadcast address, found by changing the two host octets to 255, means that the broad-
cast address is 191.255.255.255. It looks more like a broadcast address for a Class A network,
but it is actually the broadcast address for Class B network 191.255.0.0.
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