Comment by toast0

That's possible in circuit switched networking with various types of supervision, but packet switched networking has taken over because it's much less expensive to implement.

Attempts to add connection monitoring usually make things worse --- if you need to reroute a cable, and one or both ends of the cable will detect a cable disconnection and close user sockets, that's not great, now you do a quick change with a small period of data loss but otherwise minor interruption; all of the established connections will be dropped.