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