Subnetting

[bigdan4712]

Can someone give me a link to a website that explains subnetting? My teacher doesn't really explain it well...and I need to have this down by next week so i can take my CCNA1 test and pass it...since I heard there was alot on the test that had to do with subnetting...Any help would be appreciative

(I know this is off topic, but I wasn't sure the Networking board would know this)

Dan

The Networking forum is precisely the place for this sort of question.
Next time, please read the rules carefully for this particular category and post in the correct forum.

AnandTech Moderator

 

[bsobel]

(I know this is off topic, but I wasn't sure the Networking board would know this)

:roll:

 

[BespinReactorShaft]

This isn't the "off topic" forum either...

 

[thunderroller]

you can find some help in help

 

[bigdan4712]

i see how helpful people are in this world. usually smart people are immature.

dan

 

[Calin]

Imagine that you have a network mask (expressed as a binary number) and a network address.
If you eliminate all the values from the network address where are 1 in netmask (seen as binary), you should get 0
Example: net mask 255.255.0.0, network address can be 1.1.0.0, but not 1.1.1.0 or 1.1.0.1
net mask 255.255.255.128, network address can be 1.1.0.0, 1.1.1.0 or 1.1.1.128. 1.1.1.129 can not be network address
Broadcast address - the address that in all the places that the netmask is 0 has 1.
For those examples, 1.1.255.255 and 1.1.1.127 and 1.1.1.255

All the addresses between the network address and the broadcast address are valid for the subnet you are talking about.
Example: I want a local network of 200 entries, starting from 192.168.30.1 (netmask is 255.255.255.0). Because I have two buildings with computers shared half and half, you make two subnets: 192.168.30.0 netmask 255.255.255.128 and 192.168.30.128, netmask 255.255.255.128.
In one building the computers will be 192.168.30.1, .2, .3, ... and in the other 192.168.30.129, .130 and so on