To create a route summarised address and subnet mask for the following addresses:
First I will write out the binary form of the addresses up to and including the changing octet. 11000000.10101000.11001100
From the list, I counted from the left how many bits are the same in each address, as can be seen the first 19 bits for each address are the same so that gives us the subnet mask in slash notation. So the summarised address and subnet mask is 192.168.204.0/19.
Would this be correct?