What measure to use for {HEAD ~ the cost} between {TAIL ~ two neighboring devices}, depends on the network at hand 
between
What measure to use for { HEAD ~ the cost } between { TAIL ~ two neighboring devices } , depends on the network at hand
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH