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Suppose you needed to use HTTP to download a webpage with 3 embedded images.The total no of messages saved between client ans server  starting from initiates TCP connection to receive the third object and close the connection when using persistent HTTP instead of non persistent HTTP are --------
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Using Non-Persistent connection:

Total Time= 2*RTT x 2(3*RTT)  = 8 RTT

Using Persistent connection :

Total Time= 2*RTT x 1(RTT)  =  2 RTT

 

Saving = ( Using Non-Persistent connection) -  ( Using Persistent connection )

            =  8 RTT - 2 RTT

            = 6 RTT

 

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