Cybersecurity can’t start at the firewall if the network underneath is a mess....

https://blogfreely.net/samuel-wang09/what-the-acsc-ism-says-about-network-infrastructure-controls

Cybersecurity can’t start at the firewall if the network underneath is a mess. A damaged patch lead can cause VPN handshakes to fail, while an overlooked switch with default credentials can give an intruder a path across the network