Back in the days when I did my TCP/IP for NT4 training, you had to be able to understand subnets and decide on them manually. Now further down the track, there’s a lot more use of TCP/IP as it’s the foundation of life, the universe and everything. One of my guys in the office showed me this cool website that you can use to do all the basic calculations for you for subnetting an IP network. You can check out the website here
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