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2_2 is RTT +2* time frame= 4+2*1.

2_2 is RTT +2* time frame= 4+2*1.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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**HTTP/2 versus HTTP/1.1: Object Download Delays** Consider a client and a server, separated by a Round Trip Time (RTT) of 4 time units. At time t=0, the client requests 4 objects: O1, O2, O3, and O4. - **O1** consists of 10 frames, - **O2** and **O4** each consist of 1 frame, - **O3** consists of 2 frames. In the HTTP/2 example shown, the server transmits frames to the client in the order O1, O2, O3, O4, moving to a frame from the subsequent object (i+1 mod 4) after each transmission. Each frame takes 1 time unit to transmit. **Diagram Explanation:** 1. **Left Side:** - The client sends GET requests for objects O4, O3, O2, and O1 to the server. - Arrows indicate the order of the frame transmission between the client and the server. 2. **Right Side:** - Visual representation of the objects requested. - Stacked colored rectangles depict the frames of each object. **Under HTTP/1.1** (not graphically shown), the server would transmit O1, O2, O3, O4 in a first-come-first-served (FCFS) order, completing each object before starting the next. **Calculating Object Download Delay:** The object download delay is defined as the time from the request (at t=0) to the time the object is fully received. For this HTTP/2 transmission order: - To evaluate delay, compute the sum of all object delays and divide by 4 for the average delay. **Note:** - An RTT is added to this version; therefore, the time to download O2 is calculated as: RTT + 2 * time frames = 4 + 2 * 1.
Transcribed Image Text:**HTTP/2 versus HTTP/1.1: Object Download Delays** Consider a client and a server, separated by a Round Trip Time (RTT) of 4 time units. At time t=0, the client requests 4 objects: O1, O2, O3, and O4. - **O1** consists of 10 frames, - **O2** and **O4** each consist of 1 frame, - **O3** consists of 2 frames. In the HTTP/2 example shown, the server transmits frames to the client in the order O1, O2, O3, O4, moving to a frame from the subsequent object (i+1 mod 4) after each transmission. Each frame takes 1 time unit to transmit. **Diagram Explanation:** 1. **Left Side:** - The client sends GET requests for objects O4, O3, O2, and O1 to the server. - Arrows indicate the order of the frame transmission between the client and the server. 2. **Right Side:** - Visual representation of the objects requested. - Stacked colored rectangles depict the frames of each object. **Under HTTP/1.1** (not graphically shown), the server would transmit O1, O2, O3, O4 in a first-come-first-served (FCFS) order, completing each object before starting the next. **Calculating Object Download Delay:** The object download delay is defined as the time from the request (at t=0) to the time the object is fully received. For this HTTP/2 transmission order: - To evaluate delay, compute the sum of all object delays and divide by 4 for the average delay. **Note:** - An RTT is added to this version; therefore, the time to download O2 is calculated as: RTT + 2 * time frames = 4 + 2 * 1.
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