Networks not chatting

I just accepted my first job in the industry this week. My first day in, I’m informed the internet is down for half of the school. We run 2 networks, 1 for faculty (10.1.1.x), and 1 for students/public computers (192.168.100.x).

Nobody has been in the tech department for 1 month, so there haven’t been any configuration changes or cable runs. I can ping the 10.1.1.201 (faculty gateway) but cannot ping the 192.168.100.1 (student gateway) from any computer outside of the wiring closet. Thus, every student/public computer on the 192 network has no internet.

Any suggestions for a very confused first weeker?