Professor Messer’s CompTIA Network+ Study Group – June 2012 This month: Calculating broadcast addresses, crossover cables, and IPv6 is a bad, bad, protocol. Professor Messer’s Network+ Course Notes: Have you watched my CompTIA Network+ videos, but you’d like to have all of the notes available in one place? With these detailed Network+ study guides, you can focus your study efforts and make your study time more efficient!