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TOPIC: help me how to subnet class A, B & C

help me how to subnet class A, B & C 10 years 8 months ago #13769

  • gino_bwoi
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i got a college assignment on networking i have no clue about subnetting i know roughly but when it comes to things like this i can tget my head around it can someone please give me a full demonstration on how to subnet a, b & c on a defult ip plz i would be very greatful
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solution 10 years 8 months ago #13770

  • Arani
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dear mate,
your best bet is to go through the notes on firewall.cx under:
NETWORKING - > PROTOCOLS - > INTERNET PROTOCOL SUBNETTING.
read through it thoroughly, and then ask us any queries you have
Picking pebbles on the shore of the networking ocean
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Re: help me how to subnet class A, B & C 10 years 8 months ago #13771

  • Tarun
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This would be your best bet

Best of luck reading...
Next would be SP (Service Provider)
CCNA, CCNP (Switching), CCIE#20640
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Re: help me how to subnet class A, B & C 10 years 8 months ago #13772

You can also look at the sticky at the top of this
forum. I found the methods helpful.
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Re: help me how to subnet class A, B & C 10 years 8 months ago #13782

  • bEli_S
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to subnet a A class you must change the second octet of the network addres into binary, then you must borrow the bits, for ex: lets borrow 3 bits, if the network address is 10.0.0.0 and the subnet 255.0.0.0
you must follow this 10._ _ _} _ _ _ _ _
3bits
you're subnet mashk changes to 255.224.0.0
and you're first Network address is 10.32.0.0
and so you can continue the second Network is 10.64.0.0 and the subnetmask know is always 255.224.0.0

bye
/bEli
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subnetting 10 years 8 months ago #13807

  • Arani
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knowing about subnetting for Classes A, B and C needs greater indepth evaluation of how its being done. I will try to give you a step by step guide on how to do it.
lets start with how the different addresses are aligned according to network ID and host ID. you do know every IP address within these classes are divided into network ID and host ID. the network ID portion of a address doesn't change within the same network. the host ID changes.
now lets look at the different classes and their respective network and host ID division. i have shown the network bits with 'X' and host bits with '0'.

for class A:
X X X X X X X X. 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 0 0
for class B:
X X X X X X X X. X X X X X X X X. 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 0 0
for class C:
X X X X X X X X. X X X X X X X X. X X X X X X X X. 0 0 0 0 0 0 0 0

let me know if you have understood this, and then we will go forward
Picking pebbles on the shore of the networking ocean
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