Put your detective hat on your head and your Network Operational Investigator badge on your lapel.\u00a0 It\u2019s time for another entry to the Network Operational Investigating 101 subseries (NOI-101 for short).\u00a0 Today we are going to talk about Network Diagrams.\u00a0 Our "Crime Scene Maps", as it were.\u00a0\u00a0And if they are inaccurate\u2026 or if they are too complicated to quickly read and understand\u2026. the direct result of that will be increased time and difficulty when troubleshooting.\u00a0 And when you are troubleshooting\u2026.\u00a0TIME\u00a0is not typically a luxury you can afford. \u00a0I knew network diagrams was going to be my first post in the NOI-101 subseries. \u00a0But I also knew that network diagrams is something I feel strongly about.\u00a0 :) \u00a0 Maybe a little too strongly.\u00a0 But I think that happens when you've watched people get burned by something time and time again and not learn\u2026 not change.\u00a0HOW DO I GET THROUGH TO YOU?\u00a0 How do I impress upon you the criticality of network diagrams that are accurate, up to date, and easy to read?\u00a0Do I tell you war stories like the 6 hours of partial network down time because the culprit (a layer 2 switch) was not on the diagram (and, to make matters worse) did not have CDP enabled? \u00a0Do I tell you to take ego out of your diagram and simplify it so that if you ever have to call up a support line for help you can spend time explaining your problem and not your diagram?Do I tell you that documentation shouldn't be an afterthought?\u00a0 That the network diagram is your "crime scene map" when you are trying to figure out "who done it"?Do I tell you that 5 9s (99.999%) means you have to less than 5 minutes of unscheduled down time in an entire year?\u00a0Writing this PostI have never had such difficulty writing a post as I have with this one. I've written this post about 10 times now.\u00a0 One variation had the picture of the board of the game Clue, but with the "secret passages" between the corners missing from the board. Another variation used evacuation maps to help stress the importance of an accurate, easy to read, map. Another variation was the blueprint of a house - with every single detail of the house on one blueprint - the plumbing, the HVAC, the electricity, the carpentry, the cabinets, the placement of the furniture, etc.\u00a0 Another variation was based on a couple diagrams I found on\u00a0http:\/\/www.ratemynetworkdiagram.com\u00a0that seem to solely have been created to insure job security. \u00a0The ideas of the varying themes didn't seem to stop. \u00a0Anything I could think of to get the lightbulb to go on.\u00a0 To get a fire under you to go and start working on your diagrams. \u00a0 But then I realized something. \u00a0I was actually falling into the trap of the type of network diagram that overly complicates things.Math Excerise for You2 + 6 = ___10 - 2 = ___7 x 1 = ___Inaccurate diagram + a problem in the network = ______________________Complicated diagram + a problem in the network = _____________________Stating the ObviousEinstein was smart.Fire is hot.2 + 2 = 4The network diagram is the "crime scene map" - if it is inaccurate, misleading, or hard to understand, this will have a direct relationship to your effectiveness as an Network Operational Investigator. \u00a0Period. \u00a0Simple as that.