10 replies to this topic

[SPEhosting]

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?

[Teebor]

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 :-
http://www.subnettin..._to_subnet.html

Or are you looking for more detail?

[SPEhosting]

Teebor, on 09 October 2012 - 17:05, said:

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 :-
http://www.subnettin..._to_subnet.html

Or are you looking for more detail?

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

[+BudMan]

so you want us to do your homework

[trek]

SPEhosting, on 09 October 2012 - 17:01, said:

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?

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 8 bits
Bits for Host: ____8_____
Number of Usable Subnets: 2^8 = 256 subnets
Number of Usable Hosts/Subnet: 32 bit address - 24 bit subnet address for a /24 = 8 bits for hosts -> 2^8 - 2 = 254 hosts per subnet
Network Address: 156.192.162.0/24
Usable Address Range: 156.192.162.0 to 156.192.162.254
Broadcast Address: 156.192.162.255

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

[Kami-]

BudMan, on 09 October 2012 - 20:34, said:

so you want us to do your homework

This++

[SPEhosting]

trek, on 09 October 2012 - 21:24, said:

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 8 bits
Bits for Host: ____8_____
Number of Usable Subnets: 2^8 = 256 subnets
Number of Usable Hosts/Subnet: 32 bit address - 24 bit subnet address for a /24 = 8 bits for hosts -> 2^8 - 2 = 254 hosts per subnet
Network Address: 156.192.162.0/24
Usable Address Range: 156.192.162.0 to 156.192.162.254
Broadcast Address: 156.192.162.255

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

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 )

[+giantsnyy]

SPEhosting, on 09 October 2012 - 23:47, said:

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 )

Actually it would be 1 to 254.

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

[SPEhosting]

giantsnyy, on 09 October 2012 - 23:52, said:

Actually it would be 1 to 254.

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

ha! why did i type 256 xD I just went into binary me thinks

[pes2013]

giantsnyy, on 09 October 2012 - 23:52, said:

Actually it would be 1 to 254.

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

Incorrect. 256 is Chuck Norris.

[moloko]

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