Firewall
1. A network device to permit and / or control authorised access to / from a network by statefully filtering packets.
The device is supposedly developed in a secure and trusted manner with additional features and controls that provide assurance of a higher level of device security and software integrity.
2. A router that doesn’t work.





Also, a network security device that no one outside of IT realizes is in place and, thusly, is the cause of a large percentage of support requests involving users not able to get their new application to work properly.