A computer network diagnostic tool allows a user of a computer coupled to {HEAD ~ a computer network} to perform {TAIL ~ network diagnostics} 
A computer network diagnostic tool allows a user of a computer coupled to { HEAD ~ a computer network } to perform { TAIL ~ network diagnostics }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL