A custom server may have {HEAD ~ a number} of network products or other test devices connected to it or the custom server may be directly connected to {TAIL ~ the environment} that it will test 
A custom server may have { HEAD ~ a number } of network products or other test devices connected to it or the custom server may be directly connected to { TAIL ~ the environment } that it will test
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH