What happens when you plug two sides of a cable to a single networking device?
Depends on the router/switch. If it’s “Managed” – Like decent Netgear, Cisco or HP Procurve, or has STP (Spanning Tree Protocol) or one of its variants enabled, there’s a few seconds of absolute insanity, then the switch realises that there’s a loop in the network topology, and blocks one of the ports. (I’ve only described … Read more