I recently got a new job as a network specialist responsible for managing performance across both LANs and WAN. I'm just wondering if few folks who have managed large networks give me some feedback as to what I should focus the most. I'm reading and reviewing my networking stuff, but certainly could use some insight.
It's a heterogenious and complex environment. Of course, they won't throw me in fire and the transition is gradual (at least I hope

), but I just want to get some ideas