To show you how a subnet mask looks like, let's review the previous table.Īs mentioned, there are octets separated by dots that I called 4-tuple octet. Subnet Mask is the way an IP address represent which subnet it is under. Subnetting always relates to something called Subnet Mask. The only octet that changes is the 4th octet (the last octet). I call them 4-tuple octet.įor /24 to /32 subnets, the 1st three octets remain the same. To separate the octets, there are dots between them. Some people refer the notation as octet (8-based number system). Keep in mind that this half-and-double size concept is the very basic of subnetting as you will later find out.
The interval between one number and the next or between one number and the previous is always based on the power of two. Similarly, there is no other way to have one smaller number of the current number but to halve size the current number. From different approach, the previous number is always half size of the current number.Īs you may see, there is no other way to have the next bigger number of the current number but to double size of current number. On the table, note that the next bigger number is always double the size of the current number. To explore further, check out the following table. The Binary system number hence introduces the concept of half-and-double size. This number system also shows that you can only halve the current number to have the previous number. This number system shows that you can only double the current number to have the next bigger number. Following is an illustration.īinary system number is based on power of two (2^n). The key is to keep using decimal number system with binary number system in mind.īefore we begin, you need to refresh your math on power. This gap leads to some kind of confusion to those who are just learning networking and subnetting.īut no worries! There is an easier way to understand subnetting with less theory and more practical approach. Unfortunately we humans are used to decimal number system, hence create a gap. Yes, you are required to understand at least the basic of binary number system in order to understand subnetting process.īinary number system is used by any computers based on their nature of "on" and "off" state. As you can see from the links above, subnetting involves binary numbers. The most difficult part of understanding subnetting is probably the math (the calculation). The objective of this FAQ is to try to introduce you subnetting knowledge with less math to avoid dry reading and more on the "soul" of subnetting itself to embrace the essence.īinary Number System (2-based Number System) However unlike any other source, this FAQ tries to minimize the use of binary number system and tries to maximize the use of decimal number system which is more common among humans. There is some mention about binary number system (which you will find out soon) in regards of subnetting learning process.
Hopefully after reading this FAQ, readers can have better understanding and better appreciation of subnetting beyond a mere mathematics or beyond a certification test passing.Īs with any learning process of new knowledge, there is no "cheating", meaning you need to understand the basics.
Further, the discussion is trying to build a basis of understanding on how subnetting functionality plays fundamental part in IP network, especially in relation and/or application to IP routing and switching as part of communication ways in IP network, and to best-practice network design in general. This FAQ of subnetting discussion will be only in a perspective of IP network version 4. When you ask more IP from them, you have to pay more. You have to pay certain amount to have static IP addresses dedicated to you from your ISP. The example of pay IP addresses is Public IP addresses that you retrieved from your ISP. This is true especially when you have to pay to have those IP addresses, or you have limited IP address range to work with. Don't let IP addresses unused or go wasted. One aspect of a good network design is to optimize the IP addresses that you have. Subnetting relates to a good network design.
Subnetting is a process of partitioning a network into smaller (sub) independent network. You may wonder what subnetting is and its purpose.
#CISCO SUBNET MASK TABLE CRACK#
Here's a few links to help you finally crack that puzzle which has plagued you since you started to learn networking:ĭpocoroba's contribution to the subnetting debate.įAQ originated from this thread on dpocoroba's suggestion.
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