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Hi basically I learnt sub-netting 8 months ago... didnt touch it after I now have to do subnetting theory.... yay... and I have forgotten everything.....

maybe help me out with a few examples ? one of the many things I have to do is this...




156.192.162.56/255.255.255.0
Address Class : __b__

Bits Borrowed for Subnet: ____8_____
Bits for Host: ____8_____
Number of Usable Subnets: _____253_____
Number of Usable Hosts/Subnet: _________
Network Address: ____________________
Usable Address Range: __________
Broadcast Address: ____________________


I have put in some numbers though I think I am extremely wrong..... can you help me with this one and explain then maybe I can do the rest my self?

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Posted

I would recommend going to networking-forum.com and looking on there as they have a good way to test yourself (one of the little links on the sidbar iirc) and also teaches you a good way to do it.

Another way to learn to do it is :-
[url="http://www.subnetting-secrets.com/easy_way_to_subnet.html"]http://www.subnetting-secrets.com/easy_way_to_subnet.html[/url]

Or are you looking for more detail?

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[quote name='Teebor' timestamp='1349802300' post='595236055']
I would recommend going to networking-forum.com and looking on there as they have a good way to test yourself (one of the little links on the sidbar iirc) and also teaches you a good way to do it.

Another way to learn to do it is :-
[url="http://www.subnetting-secrets.com/easy_way_to_subnet.html"]http://www.subnettin..._to_subnet.html[/url]

Or are you looking for more detail?
[/quote]

yea I understand that but its not helping with everything on my work haha xD I am so bummed

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Posted

so you want us to do your homework ;)

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[quote name='SPEhosting' timestamp='1349802109' post='595236045']
Hi basically I learnt sub-netting 8 months ago... didnt touch it after I now have to do subnetting theory.... yay... and I have forgotten everything.....

maybe help me out with a few examples ? one of the many things I have to do is this...

156.192.162.56/255.255.255.0
Address Class : __b__

Bits Borrowed for Subnet: ____8_____
Bits for Host: ____8_____
Number of Usable Subnets: _____253_____
Number of Usable Hosts/Subnet: _________
Network Address: ____________________
Usable Address Range: __________
Broadcast Address: ____________________


I have put in some numbers though I think I am extremely wrong..... can you help me with this one and explain then maybe I can do the rest my self?
[/quote]

156.192.162.56/255.255.255.0
Address Class : B

Bits Borrowed for Subnet: Class B is a 16-bit mask, but the SN above is a /24 so you borrowed [b]8 bits[/b]
Bits for Host: ____[b]8[/b]_____
Number of Usable Subnets: 2^8 = [b]256 subnets[/b]
Number of Usable Hosts/Subnet: [b]32 bit address - 24 bit subnet address for a /24 = 8 bits for hosts -> 2^8 - 2 = 254 hosts per subnet[/b]
Network Address: [b]156.192.162.0/24[/b]
Usable Address Range: [b]156.192.162.0 to 156.192.162.254[/b]
Broadcast Address: [b]156.192.162.255[/b]

I'm pretty sure that's right... it's been a while since I passed my CCNA lol.

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Posted

[quote name='BudMan' timestamp='1349814843' post='595236469']
so you want us to do your homework ;)
[/quote]
This++

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Posted

[quote name='trek' timestamp='1349817870' post='595236539']
156.192.162.56/255.255.255.0
Address Class : B

Bits Borrowed for Subnet: Class B is a 16-bit mask, but the SN above is a /24 so you borrowed [b]8 bits[/b]
Bits for Host: ____[b]8[/b]_____
Number of Usable Subnets: 2^8 = [b]256 subnets[/b]
Number of Usable Hosts/Subnet: [b]32 bit address - 24 bit subnet address for a /24 = 8 bits for hosts -> 2^8 - 2 = 254 hosts per subnet[/b]
Network Address: [b]156.192.162.0/24[/b]
Usable Address Range: [b]156.192.162.0 to 156.192.162.254[/b]
Broadcast Address: [b]156.192.162.255[/b]

I'm pretty sure that's right... it's been a while since I passed my CCNA lol.
[/quote]

2^8 - 2 (the broadcast and the network address are not usable they are reserved ) but thanks for your help you confirmed most of my stuff

also its 1 to 255 0 and 256 are the resevered (the first and last addresses )

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Posted

[quote name='SPEhosting' timestamp='1349826479' post='595236867']
2^8 - 2 (the broadcast and the network address are not usable they are reserved ) but thanks for your help you confirmed most of my stuff

also its 1 to 255 0 and 256 are the resevered (the first and last addresses )
[/quote]

Actually it would be 1 to 254.

0 is reserved for the network, 255 is reserved for the broadcast. 256 doesn't exist.

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[quote name='giantsnyy' timestamp='1349826722' post='595236877']
Actually it would be 1 to 254.

0 is reserved for the network, 255 is reserved for the broadcast. 256 doesn't exist.
[/quote] ha! why did i type 256 xD I just went into binary me thinks

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Posted

[quote name='giantsnyy' timestamp='1349826722' post='595236877']
Actually it would be 1 to 254.

0 is reserved for the network, 255 is reserved for the broadcast. 256 doesn't exist.
[/quote]
Incorrect. 256 is Chuck Norris.

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Posted

Check out youtube. there are some great tutorials that have sped up my subnetting down to a minute or so.

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