10Linefigure wrote: » If you look here > Exam 98-366: Networking Fundamentals under 'Understanding IPv4' the first thing listed is subnetting. So you may want to know about it, and why and when its used. Also learn how to do it quickly. The site says 'Understanding protocols and services' is 45-50% of the exam so it wouldnt hurt to spend time and be proficient at it.