IP subnetting made easy?

Question

What do you think is the most confusing thing about IP subnetting? Do these illustrations help demystify the concepts effectively?

Answer 1

Subnetting is different and takes binary math to understand but its not impossible to understand. Once you get the picture of the BINARY setup it makes more sense.

Try some of the online tutorials ...
http://www.learntosubnet.com/
is a good start.

Answer 2

128 64 32 16 8 4 2 1 Remember that. Lets say you have a /30 subnet or... 255.255.255.252 You borrow 6 bits from the last octet 8 + 8 + 8 +6 = 30 AND SUM(128 64 32 16 8 4) = 252 Take the last numbers: 2 + 1 = 3 (add one) = 4 0 - 3 * 1 and 2 usable 4 - 7 * 5 and 6 usable 8 - 11 * 9 and 10 usable The first number is your network address and the last number is your broadcast address Lets say this... You have the address of: 84.103.245.187/13 or... 255.248.0.0 You borrow 5 bits from the last octet 8 + 5 = 13 AND SUM(128 64 32 16 8) = 248 Take the last numbers: 4 + 2 + 1 = 7 (add one) = 8 0 - 7 8 - 17 ... 96 - 103 Network: 84.96.0.0 First Host: 84.96.0.1 Last Host: 84.103.255.254 Broadcast: 84.103.255.255 Another: 104.53.180.207/11 255.224.0.0 Range 0-31 32-63 Network: 104.32.0.0 First Host: 104.32.0.1 Last Host: 104.63.255.254 Broadcast: 104.63.255.255 Dane

Answer 3

subnetting seems confusing at the beggining but they are quite simple. just learn how to define what ip address class you have and the rest is easy. depending on how many networks you need you borrow the bits and ot all flows automatically. pay close attention to examples that you can google and you will get it right away.
good luck.

Answer 4

no they don't. IP subnetting is not confusing the way Cisco does it. 255.255.255.255/24 very simple. how many nodes you want in the subnet?