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You sound like me...
All my Cisco courses were 8 weeks or less... I am currently finishing up my BCAN...
But to be honest subnetting is really easy... if you have the CCNA books... check out the subnetting section... learn the MAGIC Number way of figuring it out. Once you learn it you can more or less do it in your head. With a little thought I can do most of my subnets... valid ip's and broadcast ip all in my head given an address and mask.
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