i am not sure what you call this
loopbacking?
at work we have two ports side by side to plug you computer/laptop into.


if you take one network cable and plug one end into one output and the other end into the other output this crashes the network

is there a way to pick up where this happens or prevent the network from crashing?

the network is dhcp
switched
and uses an proxy prior

(if i have repeted this sorry)