Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.
IP Subnetting Step #1: Requirements Analysis
(Page 2 of 2)
Assessing Future Needs During Requirements Analysis
We need to analyze the requirements
above not only for the present network, but for the near future
as well. The current values for these two numbers represent how the
network needs to be designed today. However, designing only for the
present is not a good idea.
Suppose we have exactly four subnetworks
in our network now. In theory, we could use only two bits for the subnet
ID, since 22 is 4. However, if our company is growing rapidly,
this would be a poor choice. When we need to add a fifth subnet we'd
have a problem!
Similarly, consider the growth in
the number of hosts in a subnet. If the current largest subnet has 60
hosts, you don't want 6a bits for the host ID, because that limits you
to 62 hosts. You can divide large subnets into smaller ones, but this
may just mean unnecessarily additional work.
So, what is the near future?
The term is necessarily vague, because it depends on how far into the
future the organization wants to look. On the one hand, planning for
several years' growth can make sense, if you have enough IP addresses
to do it. On the other, you don't want to plan too far out, since changes
in the short term may cause you to completely redesign your network
Key Concept: To successfully subnet a network, you must begin by learning what the requirements of the network will be. The most important parameters to determine are the number of subnets required and the maximum number of hosts needed per subnet. Numbers should be based not just on present needs but requirements in the near future.
|If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!|
Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.