Can I use 3560G series (3560-28) switch for CCIE preperations? Also can I upgrade any 3550 switch IOS from SMI to EMI? What would you advise for access layer switches, I would like to go on CCIE Security after, so how many of switches do I need? Can I use 3550s instead 3650? What are the latest R&S official CCIE books for written and lab exams?