Subnetting Stuff - City Tech OpenLab

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Subnetting  Stuff
 
 
 
 
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The  design  process  requires  a  choice  of  where  to  place  the  dashed  line  shown  in  Figure.  But  what  is  the  right  
choice?  How  many  subnet  and  host  bits  should  the  designer  choose?  The  answers  hinge  on  the  requirements  
gathered  
in  the  early  stages  of  the  planning  process:
 
 
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Number  of  subnets  required
 
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Number  of  hosts/subnet
 
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Deriving the Network ID and Related Numbers

Each classful

network has four key numbers that describe the network. You can derive these
four numbers if you start with just one IP address in the network. The numbers are as follows

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Network number

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First (numerically lowest) usable address

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Last (numerically hi
ghest) usable address

■
Network broadcast address


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