S3SS10N Wednesday – Implementing Custom Subnet Masks

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S3SS10N Wednesday – Implementing Custom Subnet Masks

Published: August 15, 2016 | By: Kelly Handerhan | Views: 5263
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This Weeks S3SS10N Wednesday


This session covers implementing custom subnet masks and offers participants a quick and efficient shortcut to achieve this. By assigning a number, you subtract to get an increment which shows the network broken down into numerical increments. You can use this to discover the lowest value for an IP address. Essentially, we use the default subnet number to determine how many octets are needed to create the subnet mask. With a Class A or Class B address, this is pretty straightforward. However, with a class C a little more work is involved. To make sub netting easier, it is helpful to first understand decimal to binary.

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About This S3SS10N Wednesday's Contributor

Kelly Handerhan
Skilled and certified in CISSP, CASP, and PMP, SME Kelly has taught several courses on Cybrary and is highly praised for her ability to effectively communicate important information in a relate-able and understandable way.
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7 Comments
  1. when you steal 4 bits it means 248 i miss something wrong i need more explanation please

  2. Sub-netting was always one of those black boxes that only the network guys knew. I’m a Windows server guy, working along side network guys for many years, and even they often had these big, multi-page charts laying out subnet ranges.

    This made all that obsolete. Incredibly easy way to figure out subnets, and as I’m working on my CCNA right now, incredibly valuable to me.

    Thanks Kelly

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