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)
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**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.
Transcribed Image Text:**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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