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| twist 2002-09-26, 11:12 am |
| Hello my 216'ers-
What is the meaning and purpose of /24?
Ex: 10.107.3.0/24
I understand what the other numbers are for.
thanks,
Carlo | |
| maxmax79 2002-09-26, 11:18 am |
| the /24 is the cider notation for the subnet mask. It tells you have many bits are used in the subnetmask.
ie.
10.107.3.0/24 = 10.107.3.0
255.255.255 | |
| twist 2002-09-26, 11:33 am |
| thanks maxmax79-
does that mean the number could only be 8,16,24 or 32?
Carlo | |
| maxmax79 2002-09-26, 11:38 am |
| Yes it could be /8, /16,..., or even /27 depending on how you are subnetting you networks | |
| Deja-vue 2002-09-26, 12:12 pm |
| The correct notation is referred to as CIDR - it represents how the networked is subnetted. If you have /24 notation then you have a default subnet mask of 255.255.255.0 representing a 24 bit mask. If you have a /25 notation then you have a default mask of 255.255.255.128 representing a 25 bit mask. | |
| maxmax79 2002-09-26, 12:16 pm |
| Thanks for the spelling correction Deja. I just remebered hearing about, I don't think I've read about it yet. So I just thought I would wing it. | |
| Shadowwraith 2002-09-26, 1:03 pm |
| As just a side note remember that when the CIDR number is shown /?? what ever the number is is telling you that is is the left most bits.
as in if you hade the ip address of
10.107.3.0/24 and a mask of
255.255.255.0
/24 is telling you the default subnet for this ip is using the left most 24 bits or shown here
11111111.11111111.11111111.00000000
255 255 255 0
Hope this helps. | |
| Deja-vue 2002-09-26, 2:02 pm |
| quote:
Originally posted by maxmax79
Thanks for the spelling correction Deja. I just remebered hearing about, I don't think I've read about it yet. So I just thought I would wing it.
Ahem...it was actually Pavlov using my Computer...The credit belongs to her..
 | |
| Pavlov 2002-09-26, 5:08 pm |
| 
The things a girl will do while waiting for Internet Mail Services to start...
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| Deja-vue 2002-09-26, 6:26 pm |
| LOL!
I still had a good time! | |
| elio_de_santis 2002-09-27, 2:42 am |
| I read somewhere that without CIDR having been implemented in 1994 & 1995, the Internet would not be functioning today.
I know that CIDR is used in routers but does someone knows how it works ? | |
| jeff_j_black 2002-09-27, 9:32 pm |
| Yep, basically not enough addresses using classfull addressing. The history of TCP/IP alone could make a wonderfull read. Check out RCF sites on the web. | |
| mikop 2002-09-27, 10:02 pm |
| quote:
Originally posted by elio_de_santis
I read somewhere that without CIDR having been implemented in 1994 & 1995, the Internet would not be functioning today.
I know that CIDR is used in routers but does someone knows how it works ?
http://www.3com.com/other/pdfs/infr...n_US/501302.pdf
save it and read it, | |
|
| quote:
Originally posted by twist
Hello my 216'ers-
What is the meaning and purpose of /24?
Ex: 10.107.3.0/24
I understand what the other numbers are for.
thanks,
Carlo
24 = 255.255.255.0
why?
24 is the number of bits for netword id...
so
network id have 24 bits
is
11111111.11111111.11111111.
the restant bits are host ids.
8 bits for hosts ids
11111111.11111111.11111111.00000000 in binary is 255.255.255.0
24 bits for network ids, 8 for host ids... remember that ip is 32 bits.. now you can apply formula to know how many hosts you can have on this subnet!!
please someone correct me if i say anything wrong!!
maybe i take finally 70216 next friday!! | |
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| Thanks everyone I found the answer in this post.
I am still going back to my CCNA notes and reflesh on IP. As the old saying goes use it or loose it. I have use only 10% of what I learn so far in the real world. the other 90% is to pass the exam.
evazz  |
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