Yes, it is very easy. I already explained what I can do with a network in a previous post, this is just from a networking side:
With the right network monitoring software, I can gather a networks IP Addresses, VLAN's, switches (Layer 2, 3), VLAN ranges from VLAN subnet mask, IP ranges, etc.
I can access this network via Telnet (which is unsecure, which Im assuming is the network status for FA anyway). Once inside I can disconnect/connect any switch, server, VLAN, device I want to (Again, if unsecure via Telnet)
Im a network guy in the military, dealing with secure protocols such as SSH, crypto and Access lists. This is what I do, if the network is unsecure it can be easily compromised with some google, CCNA and Comptia experience.
Those of you who think their network is safe is under the wrong assumption. Everything on a network requires an IP Address, if it has an IP Address, it can be accessed by the wrong person, with the right tools...
I hope FA hired competant network/firewall guys, with atleast security+ certification from Comptia...