Cybersecurity can fail before traffic reaches a firewall. This article explains...

https://cashsbrilliantperspectives.cavandoragh.org/best-way-to-isolate-guest-wi-fi-from-internal-systems

Cybersecurity can fail before traffic reaches a firewall. This article explains why cabling, switch setup and physical access matter—and how a forgotten default password on a switch can let an attacker move across the network.