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help me how to subnet class A, B & C

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17 years 3 months ago #20851 by Dove
Hi Durk21

One more question to you...
what you think : for a class B address can i use 255.255.255.240 as a subnet musk?
according to your previous post answer is no. but i guess you have the actual picture of the network.


To answer this NO you can not use it for a CLASS B

BUT CLASS C NO PROBLEM!

This is what my teachers have show me. It should also be in any good CCNA CISCO textbook.


I belive some where you missing out the concept......

you can use the subnet mask 255.255.255.240 for Class A IP address...for Example say

IP: 10.1.1.1 / 28 (255.255.255.240)

The IP setting will give you

Network Address: 10.1.1.0
Broadcast Address: 10.1.1.15
First Host IP : 10.1.1.1
Last Host IP : 10.1.1.14


So, It says any subnet mask can be used with any IP class.


Dove
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17 years 3 months ago #20854 by durk21
I take it your referring to VLSM?

believe some where you missing out the concept......

you can use the subnet mask 255.255.255.240 for Class A IP address...for Example say

IP: 10.1.1.1 / 28 (255.255.255.240)

The IP setting will give you

Network Address: 10.1.1.0
Broadcast Address: 10.1.1.15
First Host IP : 10.1.1.1
Last Host IP : 10.1.1.14


So, It says any subnet mask can be used with any IP class.


Because i wasn't referring to the actual use of VLSM I was merely referring to the basics of subnetting as per the original topic.
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17 years 3 months ago #20859 by Smurf

Hi Durk21

One more question to you...
what you think : for a class B address can i use 255.255.255.240 as a subnet musk?
according to your previous post answer is no. but i guess you have the actual picture of the network.


To answer this NO you can not use it for a CLASS B

BUT CLASS C NO PROBLEM!

This is what my teachers have show me. It should also be in any good CCNA CISCO textbook.


I belive some where you missing out the concept......

you can use the subnet mask 255.255.255.240 for Class A IP address...for Example say

IP: 10.1.1.1 / 28 (255.255.255.240)

The IP setting will give you

Network Address: 10.1.1.0
Broadcast Address: 10.1.1.15
First Host IP : 10.1.1.1
Last Host IP : 10.1.1.14


So, It says any subnet mask can be used with any IP class.


Hehe, this was what i was just thinking on my way to work. The only explination was that we are mixing the standard Classfull subnets 255.0.0.0/255.255.0.0 & 255.255.255.0 with VLSM.

Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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17 years 3 months ago #20861 by ashok_nitc
Smurf,
thanks man!! however can you discuss something about VLSM?
I don't have idea about VLSM!! from the discussion above it seems that whatever i was trying(Dove also) to say is the VLSM?(example given by Dove is example of VLSM??)

and whatever durk21 is telling is the actual picture of classful addressing?
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17 years 3 months ago #20863 by durk21
yes thank you DOVE for pointing out what i was saying from the start I appreciate it. For those of you just reading this I was explaining Basic Subnetting not Subnetting using VLSM.
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17 years 3 months ago #20864 by durk21

Smurf,
thanks man!! however can you discuss something about VLSM?
I don't have idea about VLSM!! from the discussion above it seems that whatever i was trying(Dove also) to say is the VLSM?(example given by Dove is example of VLSM??)

and whatever durk21 is telling is the actual picture of classful addressing?


Yes I am Using the CLASSFUL Subnetting technique in my previous posts. I AM NOT NOT subnetting using VLSM. If you want to subnet using VLSM look at Doves example.

I was posting on the original topic.
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