http://fengnet.com/book/CCNA%20Portable/ch02lev1sec2.html
Alright I was brushing up on some of the basics but I have a quick question on VLSM. If you jump down to step 5: determine network numbers for serial links at the end it talks about recombining sub-subnets. 00010000 = .16/30 through 00111100 = .60/30 it says they are recombined into 00010000 = .16/28. How did they determine this? Why is it .16 and why is it /28 instead of /30? Thanks for the help.
Oh by the way some of you may find some of these books on this website useful.. it has a few cisco books, some linux books, etc. you just have to view them online but they are organized quite well. You can find them here:
http://fengnet.com/book/. If this is a violation of the rules I will happily edit my post and remove the links. I just needed to paste that first example so people would know exactly what I was asking.
