Cybersecurity can fall apart before a firewall gets involved. A poor patch lead...

https://wiki-square.win/index.php/How_Do_I_Tell_If_Packet_Loss_Is_from_Cabling_or_Switching%3F

Cybersecurity can fall apart before a firewall gets involved. A poor patch lead can interrupt VPN handshakes, while a switch left with its default password can give an attacker a path across the network