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| plbass 2001-08-15, 5:32 pm |
| Can anybody explain the subnetting process for me and how exactly do you get what you get, please? This is the only thing that I don't get in the 70-210 exam. | |
| fatherboard 2001-08-15, 7:13 pm |
| Just know you class and IP range.Subnetting is used to know the network ID and host ID of a given IP address.
Class A =1 to 126
class B =128 to 191
Class C = 192 to 223
Subnet Mask
If it's class A =255.0.0.0
class B =255.255.0.0
class C = 255.255.255.0
255 is the network id
0 is the host id
Example u have an IP add of 193.24.124.3
it falls on class C(look at the chart above) so the default subnet for that is 255.255.255.0.The network ID is 193.24.124
and the host ID is 3.
I hope i helped you out
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| Subnetting is the process of borrowing bits from the host bits to allow you to break down your network into smaller more manageable sizes
example
11111111 11111111 11111111 00000000
255 255 255 0
this is a class c default subnet mask
now lets say you want to divide your class c network in smaller sizes you would borrow some bits from your host bits
so lets borrow 3 for example
11111111 11111111 11111111 11100000
which gives us a subnet mask of
255 255 255 224
which divides our network into 6 subnets and allows us to have 30 machines on each subnet....
we arrive at these numbers by doing the following
# of subnets = 2x2=4x2=8-2=6 this is because we cannot have networks starting with all 1's or 0's
and because we have 5 bits left for host(machines) we do the following 2x2=4x2=8x2=16x2=32-2=30 hosts (machines)
again because we canot have hosts with all 1's or 0's in the address we subtract 2
you will also notice that the number of hosts is down from a default class network
254 with the default as compared to 180 with our subnetted network
I hope this helps you
Ed | |
| plbass 2001-08-15, 7:48 pm |
| thanx for your help. I totally understand the classes of ip addresses thing and the binary system. the thing i still don't get is how you can arrive at the number of subnets possible for that particular IP address and what the subnet #'s are. | |
| kjones 2001-08-15, 8:03 pm |
| quote:
Originally posted by plbass
Can anybody explain the subnetting process for me and how exactly do you get what you get, please? This is the only thing that I don't get in the 70-210 exam.
Heres a link that I hope will help you. 
LINK:
http://www.mcsefreak.com/subnetting.htm
Hope it helps you. Freak has a good site for that. | |
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| Trouble Man 2001-08-15, 8:52 pm |
| If you've already tried Freak's site, try http://www.learntosubnet.com. If that doesn't help, be more specific in your problem and give us a specific example of a problem you have trouble with if you can. We can't give a whole class on subnetting here, but I (and I'm sure others) are willing to give a very in-depth explanation of a problem your having. | |
| plbass 2001-08-16, 8:50 am |
| I re-read freak's site and NOW I GET SUBNETTING. WHOOOO-HOO! | |
| kjones 2001-08-16, 3:47 pm |
| quote:
Originally posted by plbass
I re-read freak's site and NOW I GET SUBNETTING. WHOOOO-HOO!
I'm glad it helped you.
I'm sure Freak would love that. | |
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| plbass 2001-08-17, 7:40 am |
| thanx for all you guys help. | |
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