To determine the subnet mask from the information provided, we need to convert the last octet, which is given as 11100000 in binary, to decimal.
The binary 11100000 can be broken down as follows:
- The first bit (1) represents 2^7 = 128
- The second bit (1) represents 2^6 = 64
- The third bit (1) represents 2^5 = 32
- The fourth bit (0) represents 2^4 = 0
- The fifth bit (0) represents 2^3 = 0
- The sixth bit (0) represents 2^2 = 0
- The seventh bit (0) represents 2^1 = 0
- The eighth bit (0) represents 2^0 = 0
Adding these values together:
- 128 + 64 + 32 = 224
Thus, the last octet in decimal is 224. Therefore, the complete subnet mask is:
255.255.255.224
So, the correct answer is:
255.255.255.224