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vandavieboy
 Post subject: subnetting ?
PostPosted: Tue Feb 21, 2012 6:36 pm 
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looking to get some advice on subnetting !! doing my bsc in networking but for some reason i just cant get my head around it
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killabee
 Post subject: Re: subnetting ?
PostPosted: Tue Feb 21, 2012 9:12 pm 
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How are you struggling with it?
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Steve
 Post subject: Re: subnetting ?
PostPosted: Tue Feb 21, 2012 11:13 pm 
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Check out this site tool, practice subnetting. It presents a completely random problem with the option to view the answer and the work.

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vandavieboy
 Post subject: Re: subnetting ?
PostPosted: Wed Feb 22, 2012 3:46 am 
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@killabee !! i just cant grasp how to work out subnets from ip addresses and also ip addressses from subnets !! iv been going over loads of info from various sources but its just not clicking with me !! any chance if i gave you a simple question (apparantly) you could try and give me advice on how to work it out ?
thanks in advance !!
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mellowd
 Post subject: Re: subnetting ?
PostPosted: Wed Feb 22, 2012 3:49 am 
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Just do the binary

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vandavieboy
 Post subject: Re: subnetting ?
PostPosted: Wed Feb 22, 2012 4:03 am 
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Assuming the usual convention specify the IP address of the default gateway in the 20th subnet from the address 172.16.0.0 which has been subnetted to allow for 40 subnets.

i dont get understand how this is done !! sorry if this is annoying but for the life of me i just dont get it !!
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ristau5741
 Post subject: Re: subnetting ?
PostPosted: Wed Feb 22, 2012 8:22 am 
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vandavieboy wrote:
Assuming the usual convention specify the IP address of the default gateway in the 20th subnet from the address 172.16.0.0 which has been subnetted to allow for 40 subnets.

i dont get understand how this is done !! sorry if this is annoying but for the life of me i just dont get it !!



trick question, any useable ip address in the 20th subnet could be the default gateway.

btw, that network cant be subnetted to allow for 40 subnets, it'd either be 32 or 64 subnets,
stick with the powers of 2, and you'll catch on.

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vandavieboy
 Post subject: Re: subnetting ?
PostPosted: Wed Feb 22, 2012 10:27 am 
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apparantly the answer is 172.16.83.254 but i dont know how to get that
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Don_quixote
 Post subject: Re: subnetting ?
PostPosted: Thu Feb 23, 2012 1:07 pm 
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How did you come up with this IP address?

I got this range for 20th 172.16.76.0 - 172.16.79.255

Mask 255.255.252.0

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Last edited by Don_quixote on Thu Feb 23, 2012 3:11 pm, edited 1 time in total.

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ristau5741
 Post subject: Re: subnetting ?
PostPosted: Thu Feb 23, 2012 1:28 pm 
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vandavieboy wrote:
apparantly the answer is 172.16.83.254 but i dont know how to get that



this would be this highest usable ip address in the 21st subnet 172.16.80.0/22
unless someone started counting at zero. then it'd be the 20th subnet

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DieselJeeper
 Post subject: Re: subnetting ?
PostPosted: Thu Apr 12, 2012 1:41 pm 
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I'm several days late and dollars short here, but has the OP seen this? Step through it as they "show work", and it's VERY helpful...
practicesubnetting.php#
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Steve
 Post subject: Re: subnetting ?
PostPosted: Thu Apr 12, 2012 2:18 pm 
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I linked to it earlier in the thread.

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