I have a CCNA 2.0 that my friend let me borrow, but I dont have the cash right now to buy the 3.0 book, if I read this book, will I be reading anything omitted from the test? what exactly does the new test consist of? I was thinking I would use this test to study, and in a few weeks, buy the new book and skim and see what I missed. Thanks in advance for help.