**Hop-by-hop congestion control**We learned about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach, a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space.Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow?**Diagram Explanation:**1. **Host A and Host B** - These hosts represent the sender and receiver in the network.2. **Links with Capacity** - The first and third links have capacity R, while the middle link has capacity R/2.3. **Buffer Space** - There are buffers indicated at various points along the path to monitor and manage congestion.4. **Data Flow** - - \( \lambda_{in} \) represents the original data rate entering the network. - \( \lambda^{'}_{in} \) represents the original data rate plus retransmitted data. - \( \lambda_{out} \) represents the data rate exiting the network.5. **Arrows and Colors** - Red lines represent the flow of original data, while other specific colors and arrows illustrate the buffering and potential congestion points along the link path.**Question:**With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow?- [ ] Yes- [ ] No

in hop-by-hop congnetion control just because of buffer overflow the sender does not perform the…

Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow? Host A -in: original data

Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow? Host A -in: original data

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

**Hop-by-hop congestion control**

We learned about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach, a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space.

Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow?

**Diagram Explanation:**
1. **Host A and Host B** - These hosts represent the sender and receiver in the network.
2. **Links with Capacity** - The first and third links have capacity R, while the middle link has capacity R/2.
3. **Buffer Space** - There are buffers indicated at various points along the path to monitor and manage congestion.
4. **Data Flow** -
- \( \lambda_{in} \) represents the original data rate entering the network.
- \( \lambda^{'}_{in} \) represents the original data rate plus retransmitted data.
- \( \lambda_{out} \) represents the data rate exiting the network.
5. **Arrows and Colors** - Red lines represent the flow of original data, while other specific colors and arrows illustrate the buffering and potential congestion points along the link path.

**Question:**
With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow?

- [ ] Yes
- [ ] No

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