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Hi, have any of you guys got any time just to explain subnet masking to me.
I need to know how to assign subnet masks if someone says "ok, you got 5,000 Pc's here - network them..." well, of course you need subnet masking to split the collision domain and get all the PC's on at once.
However, I'm finding it rather 'strange' to how it works... No one has really explained how it's actually found out. I need Class A, B and C IP's and subnets to be worked out please.
Can any one help me understand it at all? It just doesn't flow - but there again, no one has explained it to me completly yet, and online tutorials seem incomplete and don't teach how to work it out.
Thanks in advance.
Here is an example of how to calculate a Network range:
A network ID of 22.214.171.124/20 means that a subnet mask will be used that contain 20 1s in its binary form (The decimal equivalent of this will be a subnet mask of 255.255.240.0). The subnet mask will look like the following:
11111111 11111111 11110000 00000000
Therefore, the first 20 digits if IP addresses will represent the network ID and the last 12 digits will represent the host ID. In this case the network portion will be:
01110101 01001000 0010
The smallest host ID will be:
which will yield an IP address of 126.96.36.199. Note that all zeros is not a valid host ID.
The largest host ID will be:
Which will yield an IP address of 188.8.131.52. Note that ones is not a valid host ID. Therefore the available address range given a network ID of 184.108.40.206/20 will be 220.127.116.11 - 18.104.22.168
click here for further information.
unfortunately, explaining subnet masking is very difficult without actually being to write it down, and show you where each value comes from
recap has made a good effort, but to understand fully, you really need someone to show you, in person, and on paper
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