NOTE: The reason you subtract 1 is because you start counting at 0 with subnetting (we do not start at 1).
For example, if you have this 192.168.1.5 /28 you will increment by 16.
16 addresses starting at 0 is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
If we did the next 16 options it would 16 through 31; however, it is easier
for us to think 16 + 16 - 1 = 31
This video explains how to quickly identify the network address, first host address, last host address, and broadcast address for IPv4 subnetting. This video is different from other videos because I show how to quickly identify the "Magic Number" to use for incrementing. If you have any questions or concerns, post them in the comments.
Easy Subnetting Using Magic Number
Теги
techciscoeasyfastquickccentmagic numbermagic octetoctet of interestmisc techsubnet maskclass bcheat sheetccnasubnetsubnetting made easysubnettingsubnetting tutorial for beginnerstutorialsubnetting practice for beginnerssubnetting practice problems with solutionssubnetting practice questionsccna subnettingccna subnetting questions and answersccna subnetting made easyicnd1icnd2
