Subnet masking

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matt5556

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Hi there, first of all I'm new to this forum so if this is in the wrong place, go easy on me.
Could anyone help me understand subnet masking, in the most simplistic way possible, its for my course and I'm very confused about it.

also, can anyone explain this to me in more detail? http://prntscr.com/6dfrn9

thanks in advanced.
 

TerryNet

Terry
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Here is my very simple minded understanding. It probably will not suffice for answering a test question, but it may help your understanding.

A subnet mask is 32 bits beginning with m 1's and ending with n 0's (m+n=32). Wherever there is a 1 bit all IPs in the subnet will have the same value. Wherever there is a zero the IPs may be the same or may differ.

Example: Mask = 255.255.255.0 (24 1's and 8 0's) and an IP in the subnet is 192.168.3.17. The subnet consists of all IPs 192.168.3.0 through 192.168.3.255.
 

matt5556

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Mar 6, 2015
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so, from my understanding

say if i had a ip for example, 192.168.1.1
and a subnet mask of 255.255.255.0

192.168.1 would be the network? say like, if you geolocate a ip it shows the provider, would this basically be connected to the isp?

and the 0 is just a random number? is subnet masking for private networks only
 

matt5556

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im still very confused on this subject, why is it used and what is it used for? and why are there different classes? (sorry, im very new to networking.)
 

TerryNet

Terry
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You'll need to get most of those answers from your class lectures, texts and reference materials. You can also find a lot of material on the web.
 
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