### Analysis of RDT 2.2 Sender and Receiver FSM Transitions#### Problem Statement:Consider the RDT 2.2 sender and receiver below, with FSM (Finite State Machine) transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial `rdt_send()` call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur.#### Possible Sequences:A) S0, R0, S1, R1, S2B) S0, R0, S2, S3, R2C) S0, R0, S2, R1, S3D) S0, R0, S1, R1, S1#### Diagrams:##### RDT 2.2 Sender FSM:- **S0**: Wait for call from above- **S1**: Wait for ACK 0- **S2**: Wait for ACK 1- **S3**: Wait for call from above (ACK received)- **S4**: Wait for call from above (ACK received)- **S5**: Wait for call from above (ACK received)##### RDT 2.2 Receiver FSM:- **R0**: Wait for 0 from below- **R1**: Wait for 1 from below- **R2**: Wait for 1 from below (data received)- **R3**: Wait for 0 from below (data received)**Explanation of Transitions with Contextual Descriptions:**1. **Sender (S0 to S1):** - From the initial state S0, the sender sends data (for packet 0) and transitions to state S1 to wait for an acknowledgment (ACK) for packet 0. 2. **Receiver (R0 to R1):** - In its initial state R0, the receiver gets the packet, delivers the data, and sends an ACK for packet 0. Then the receiver transitions to state R1 to wait for a packet with sequence number 1. 3. **Sender (S1 to S2):** - Once an ACK for packet 0 is received, the sender moves back to state S0 or

S0 R0 S1 R1 S1 --- this is possible sequence of transition. S0 is performed at sender when the…

Consider the rdt 2.2 sender and receiver below, with FSM transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial rdt_send() call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur. A) SO, RO, S1, R1, S2 B) SO, RO, S2, S3, R2 C) SO, RO, S2, R1, S3 D) SO, RO, S1, R1, S1

Consider the rdt 2.2 sender and receiver below, with FSM transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial rdt_send() call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur. A) SO, RO, S1, R1, S2 B) SO, RO, S2, S3, R2 C) SO, RO, S2, R1, S3 D) SO, RO, S1, R1, S1

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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Concept explainers

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

### Analysis of RDT 2.2 Sender and Receiver FSM Transitions

#### Problem Statement:
Consider the RDT 2.2 sender and receiver below, with FSM (Finite State Machine) transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial `rdt_send()` call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur.

#### Possible Sequences:
A) S0, R0, S1, R1, S2
B) S0, R0, S2, S3, R2
C) S0, R0, S2, R1, S3
D) S0, R0, S1, R1, S1

#### Diagrams:
##### RDT 2.2 Sender FSM:
- **S0**: Wait for call from above
- **S1**: Wait for ACK 0
- **S2**: Wait for ACK 1
- **S3**: Wait for call from above (ACK received)
- **S4**: Wait for call from above (ACK received)
- **S5**: Wait for call from above (ACK received)

##### RDT 2.2 Receiver FSM:
- **R0**: Wait for 0 from below
- **R1**: Wait for 1 from below
- **R2**: Wait for 1 from below (data received)
- **R3**: Wait for 0 from below (data received)

**Explanation of Transitions with Contextual Descriptions:**
1. **Sender (S0 to S1):**
- From the initial state S0, the sender sends data (for packet 0) and transitions to state S1 to wait for an acknowledgment (ACK) for packet 0.

2. **Receiver (R0 to R1):**
- In its initial state R0, the receiver gets the packet, delivers the data, and sends an ACK for packet 0. Then the receiver transitions to state R1 to wait for a packet with sequence number 1.

3. **Sender (S1 to S2):**
- Once an ACK for packet 0 is received, the sender moves back to state S0 or

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