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