tl/dr: Here is a nice chart for you! I created the below chart a few years ago to post up for reference some of my coworkers would forget what our subnet mask was suppose to be. It didn't really work ...

Put your detective hat on your head and your Network Operational Investigator badge on your lapel. It’s time for another entry to the Network Operational Investigating 101 subseries (NOI-101 for short ...