2.2-05. Download delays for 100 objects (HTTP 1.0). Consider an HTTP 1.0 client and server. The RTT delay between the client and server is 2 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds, as shown below for the first of these 100 requests. You can assume that any other HTTP message not containing an object sent by the client and server has a negligible (zero) transmission time. Suppose the client makes 100 requests, one after the other, waiting for a reply to a request before sending the next request.Using HTTP 1.0, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?Group of answer choices300 secs700 secs203 secs502 secs500 secs
Question
2.2-05. Download delays for 100 objects (HTTP 1.0). Consider an HTTP 1.0 client and server. The RTT delay between the client and server is 2 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds, as shown below for the first of these 100 requests. You can assume that any other HTTP message not containing an object sent by the client and server has a negligible (zero) transmission time. Suppose the client makes 100 requests, one after the other, waiting for a reply to a request before sending the next request.Using HTTP 1.0, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?Group of answer choices300 secs700 secs203 secs502 secs500 secs
Solution
To solve this problem, we need to calculate the total time taken for the client to receive all 100 objects using HTTP 1.0. Here are the steps:
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Understand the process for a single request-response cycle:
- The client sends a request to the server.
- The request takes one RTT (Round-Trip Time) to reach the server and for the server to acknowledge the request. This is 2 seconds.
- The server then takes 3 seconds to transmit the object.
- The total time for one request-response cycle is therefore .
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Calculate the total time for 100 requests:
- Since the client waits for the reply to each request before sending the next one, each request-response cycle is independent and sequential.
- For 100 objects, the total time is .
Therefore, the total time that elapses between the client transmitting the first request and the receipt of the last requested object is 500 seconds.
The correct answer is: 500 secs
Similar Questions
2.2-09. HTTP/2 versus HTTP/1.1: object download delays. Consider a client and a server, separated by an RTT of 4 time units. The client makes a request for 4 objects at t=0. O1 consists of 10 frames, O2 and O4 each consist of 1 frame, and O3 consists of 2 frames. In the HTTP/2 example shown below, the server is transmitting frames to the client in the order O1, O2, O3, O4 (as long as there are frames of type i to transmit, and when not the server just moves on to a frame from object i+1 mod 4). Each frame takes 1 time unit to transmit.Under HTTP 1.1 (not shown below), the server would send O1, O2, O3, O4 in that first-come-first-served (FCFS) order, sending each object in its entirety before moving on to send the next object in that order.Let’s define the object download delay as the time from when an object is requested (at t=0 below) to the time that object is received in its entirety. What is the average object download delay (the sum of the four object download delays divided by 4) under the HTTP/2 object frame transmission order shown below and under HTTP/1.1 O1, O2, O3, O4 object transmission order?Group of answer choicesAverage object download delay under HTTP/1.1: 16.0, under HTTP/2: 10.5Average object download delay under HTTP/1.1: 14.0, under HTTP/2: 9.5Average object download delay under HTTP/1.1: 22.0, under HTTP/2: 17.5Average object download delay under HTTP/1.1: 24.0, under HTTP/2: 18.0Average object download delay under HTTP/1.1: 18.0, under HTTP/2: 14.0Average object download delay under HTTP/1.1: 12.5, under HTTP/2: 10.0
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