My corporate office purchased this "25x UMB‐DNS‐ADV‐K9 Cisco Umbrella DNS Security Advantage."The umbrella DNS are. 208.67.222.222208.67.220.220we can use them free of cost in any network. I am already using it in my PC. why we need to buy this "25x ...

I am using "FPR2110-NGFW-K9" this firepower in my network. It was working very well but, in a day, it stopped working, that's mean it was not pass traffic throughout it. My core router is mikrotik where all IP is assigned. My network topology is:mikr...