Backslash?

I'm only about half way into studying for the Network+ exam but I keep seeing subnet addresses like this---128.107.7.0/24 I know I'm jumping ahead but what is the purpose of the backslash in this address?

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dynamik

It's just another way of specifying the subnet mask. The /24 denotes that there are 24 bits in the subnet mask. It's the same as 255.255.255.0 or 11111111.11111111.11111111.00000000.

charliepaul

haha Oh that's easy! Thanks

Kikode

Hehe thanks dynamik that one sentence totally refreshed my memory on sub netting. In case anyone still doesn't understand the 8 bits in each octet = 128, 64, 32, 16, 8, 4, 2, 1 respectively.

KGhaleon

and for later on remember:
128 192 224 240 248 252 254 255

c0d3_w0lf

KGhaleon wrote:

and for later on remember:
128 192 224 240 248 252 254 255

Quoted for truth. That one line can make your calculations very nice and easy. I made myself a chart when doing subnetting questions that had basically everything I needed to make subnetting questions super fast and easy.

KGhaleon

I can subnet pretty fast in my head, and there are a lot of tips and tricks out there, but calculating hosts can be a pain unless you memorize all the powers.

2^7=128
2^8=256
2^9=512
2^10=1024
2^11=2048
2^12=4096
etc
etc

>_<