The first dns server visited is the local dns server with an RTT delay of RTT$=10$msecs the second $($rdt$1,$root$),$ third $($rdt$2,$TLD$)$ and fourth $($rdt$3,$ AUTH$)$ DNS servers contacted by the local DNS server have RtTs of $20,30,40$ Msecs RTT between the local host and the web server containing the object is RTT http $=50$ Msecs for each object not including transmission delay suppose an html file references $3$ very small objects so total of $4$ objects including the html file all in sane server the total transmission delay for $4$ objects is $400$ ms so $100$ each assume that the pare had been visited before and your browser has cached $3$ of the objects also the local dns cached the ip adress when you go to the website again how much time in Msecs elapses the client receives am the objects assuming persistent HTTP