Professor Messer’s CompTIA Network+ Study Group – October 2012 This month; switching and routing tables, troubleshooting slow networks, default gateways, and subnetting practice. 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!