The starting IP address of the class B is 128.0.0.0 to 191.255.255.255
Hence, we can say that in our case IP address will start from 128.0.0.0
Headquarter required 2000 addresses, so the nearest size is
So, IP of headquarter starts from 128.0.0 to 128.0.7. 255, here 48 address will be unused.
Branch A required 800 addresses, so nearest block size
Starting IP of branch A 128.0.8.0 to 128.0.11.255, for this unused address 224
Branch B required 300 address it means nearest size
Starting IP of branch B 128.0.12.0 to 128.0.13.255, for this unused address 212
Branch C required 200 address it means nearest size
Starting IP of branch B 128.0.14.0 to 128.0.14.255, for this unused address 56
Branch C required 120 address it means nearest size
Starting IP of branch B 128.0.15.0 to 128.0.15.127, for this unused address 8
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