should total time be 2*propgation delay + transmission time

Yes, you're absolutely correct. The total time should indeed include the round-trip propagation delay (i.e., \(2 \times\) the one-way propagation delay) because the file access protocol involves a request from the user and a response from the server.

### Correct Calculation

1. **Transmission Time**: The time taken to transmit the file over the link.
   \[
   \text{Transmission Time} = \frac{\text{File Size}}{\text{Link Speed}} = \frac{80 \times 10^6 \text{ bits}}{10^9 \text{ bps}} = 0.08 \text{ s}
   \]

2. **Total Propagation Delay**: Since the protocol involves a request and a response, the total propagation delay is twice the one-way delay.
   \[
   \text{Total Propagation Delay} = 2 \times \text{Propagation Delay} = 2 \times 0.04 \text{ s} = 0.08 \text{ s}
   \]

3. **Total Time**: The sum of the transmission time and the total propagation delay.
   \[
   \text{Total Time} = \text{Transmission Time} + \text{Total Propagation Delay} = 0.08 \text{ s} + 0.08 \text{ s} = 0.16 \text{ s}
   \]

4. **Effective Throughput**: The effective throughput is the file size divided by the total time.
   \[
   \text{Effective Throughput} = \frac{\text{File Size}}{\text{Total Time}} = \frac{80 \times 10^6 \text{ bits}}{0.16 \text{ s}} = 500 \times 10^6 \text{ bps}
   \]

So, the corrected effective throughput as measured on the user's side is **500,000,000 bps**.

Would you like to explore further details or ask any additional questions? Here are five related questions to think about:

1. What would happen to the effective throughput if the file size was much larger?
2. How does increasing the link speed affect the effective throughput?
3. What are the effects of varying propagation delay on different types of networks (e.g., LAN vs. WAN)?
4. How can the file access protocol be optimized to reduce the impact of propagation delay?
5. What other factors could influence the effective throughput in a real-world scenario?

**Tip:** Always consider the complete process when calculating network performance metrics, including any protocol-related delays such as round-trip time.

Explore how to calculate the total time for network file access protocols, including transmission time and round-trip propagation delay. Learn about effective throughput and its implications in network performance.

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