Broadcast address: 10.79.255.255 is thecorrect answer. The process of finding the broadcast ID when the mask is neither 255 nor 0 is more complicated. In order to find the broadcast ID you have to find the network ID multiplier.
The network ID multiplier can be found once you subtract the 256 – last octet from the mask that is neither 255 nor 0. The subnet mask is 255.248.0.0, so the network ID multiplier is 256 – 248 = 8
The possible subnet IDs are:
10.0.0.0
10.8.0.0
10.16.0.0
10.24.0.0
etc etc
The network 10.72.0.0 is it as the IP address of 10.75.20.3 belongs to that particular network IP range.
The IP address range of the network is 10.72.0.0 – 10.79.255.255 (the next address 10.80.0.0 is the next subnet ID)
The broadcast address is the last address of the network so, the broadcast address is 10.79.255.255.
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