The connections between {TAIL ~ connection management device} 20 and server 14 are typically {HEAD ~ persistent connections} 
The connections between { TAIL ~ connection management device } 20 and server 14 are typically { HEAD ~ persistent connections }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD