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HTTP Non-Persistent & Persistent Connection | Set 2 (Practice Question)

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Prerequisite: HTTP Non-Persistent & Persistent Connection – Set 1

For question point of view you need to know that Non-persistent connection is known as HTTP 1.0 and Persistent connection is known as HTTP 1.1.

    • Non-Persistent Connection: It requires connection setup again and again for each object to send.
    • Persistent connection: It does not require connection setup again and again. Multiple objects can use connection.

    Questions : Assume that you have base HTML file with 30 embedded images, images & base file are small enough to fit in one TCP segment. How many RTT are required to retrieve base file & images under-following condition :
    (i) Non-Persistent connection without parallel connection
    (ii) Non-persistent connection with 10 parallel connection
    (iii) Persistent connection without pipe-lining
    (iv) Persistent connection with pipe-lining
    (Assume RTT dominates all other time)

    Explanation :
    2RTT is the initial required connection one for TCP connection and one for HTML base file.

    Total time = 2RTT + transmit time

    (i) Non-Persistent connection with no parallel connection :
    Here for each image 2 RTT are required one for TCP connection and one for image to send.
    So transmit time for 30 images = 2*(30 RTT) = 60 RTT
    Total time = 2 RTT+60 RTT = 62RTT

    (ii) Non-persistent connection with 10 parallel connection :
    Here 10 images can be send simultaneously.
    So for 30 images it required -> 2*(30/10) = 6RTT
    Total time = 2 RTT + 6 RTT = 8RTT

    (iii) Persistent connection without pipelining :
    Here TCP connection is required again and again.
    So for 30 images it requires -> 30 RTTs
    Total time = 2 RTT + 30 RTT = 32RTT

    (iv) Persistent connection with pipe-lining :
    Since it is Persistent connection TCP connection is not required again and again.
    Pipe-lining means in one packet only images which can fit, can be send.
    In Pipe-lining connection we can send all images in 1RTT.
    Total time = 2 RTT + 1 RTT = 3RTT


    Last Updated : 21 Sep, 2017
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