Inheriting Someone Else's Network: What to Fix, What to Leave Alone, and How Not to Destroy Your Credibility

You just got promoted or changed jobs. Now you're managing a network you didn't design, with decisions you don't agree with, and configurations that make you cringe. Do you change everything? Leave it alone? How do you prove yourself without breaking things or alienating the people who built it? Here's what actually works when inheriting someone else's infrastructure.