Subnet Method Summary
Rahaf Nsour.
This summary is taken from this YouTube video YouTube Video
1. Take the number of the subnets from the question.
2. Take the whole column of the subnet number. (If the number of the subnets are not in
the table we take the larger / for example if we asked for 3 subnets we take 4)
3. Find netowrks IP (Subnet IP):
1) The first network IP is always the original network IP.
2) To find the second IP adress, add the host number to the first IP adress.
3) To find the third IP adress, add the host number to the second IP adress.
4) Continue in the same method to find the rest of IP adresses.
4. Find the subnet mask take it from the table.
5. Find the number of usable hosts (number of hosts):
1) From the table, we take the host number (which is the total number of a host IDs
for each network).
2) Number of usable hosts = Host number (from the table) – 2
o Minus 2 because: The first host IP for the network IP, The last network IP for the
broadcast IP.
