Interconnecting Ethernet Switches
If you need it, even more complex arrangements are possible
You can interconnect Ethernet switches, and, if you use optical fiber
rather than wire, the distances between switches jump to distances more
like those on an aircraft carrier rather than a fishing vessel. It's
unlikely, but you just might have a difficult enough path, between
points on a large vessel, to need this.
A more likely reason to want such interconnection is that the cable
path would go across a source of electrical noise, such as the engines
or generators, optical fiber is essentially immune to "static".