Consider an HTTP 1.1 client and server. The RTT delay between the client and server is 1 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds. initiate TCP connection RTT request file RTT. time to -transmit file file received time time 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 30 requests, one after the other, waiting for a reply to a request before sending the next request. Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?

Consider an HTTP 1.1 client and server. The RTT delay between the client and server is 1 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds. initiate TCP connection RTT request file RTT. time to -transmit file file received time time 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 30 requests, one after the other, waiting for a reply to a request before sending the next request. Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?

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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Question

**Understanding RTT and HTTP 1.1 Request Timing**

Consider an HTTP 1.1 client and server. The Round Trip Time (RTT) delay between the client and server is 1 second. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds.

### Diagram Explanation

The diagram shows the sequence of actions between a client and a server:

1. **Initiate TCP Connection:** This involves an RTT of 1 second.
2. **Request File:** After the connection initiation, another RTT of 1 second occurs as the file is requested.
3. **Time to Transmit File:** It takes an additional 3 seconds to transmit the file.
4. **File Received:** This indicates the time when the file is completely received.

The diagram illustrates these phases on a time axis.

### Problem Description

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 30 requests, one after the other, waiting for a reply to a request before sending the next request.

**Question:** Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?

### Solution Approach

For each request:
- **RTT for initial request:** 1 second
- **RTT for file request:** 1 second
- **Time to transmit file:** 3 seconds

Therefore, each object's total time is 1 + 1 + 3 = 5 seconds. Since there are 30 sequential requests:

Total time = 30 requests × 5 seconds/request = 150 seconds

Thus, the total time elapsed from the first request transmission to the last object's receipt is 150 seconds.

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