Question

In the network 200.10.11.144/27, the fourth octet (in decimal) of the last IP address of the network which can be assigned to a host is________.

Answer 1

Binary representation if given IP address is => 11001000 00001010 00001011 10010000

The first address in the block can be found by setting the rightmost 32 - n bits to 0.

The last address in the block can be found by setting the rightmost 32 - n bits to 1.

Here prefix length, n = 27

Set the last 32 - 27 = 5 bits to 1.

Last address => 11001000 00001010 00001011 10011111 => 200.10.11.159​

But it is the network broadcast address. Hence last address will be 11001000 00001010 00001011 10011110 => 200.10.11.158