**4.2-1a. Packet Scheduling (FCFS).**Consider the pattern of red and green packet arrivals to a router’s output port queue, shown below. Suppose each packet takes one time slot to be transmitted, and can only begin transmission at the beginning of a time slot after its arrival. Indicate the sequence of departing packet numbers (at t = 1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Give your answer as 7 ordered digits (each corresponding to the packet number of a departing packet), with a single space between each digit, and no spaces before the first or after the last digit, e.g., in a form like 7 6 5 4 3 2 1.**Diagram Explanation:**- The diagram is a timeline divided into time slots, labeled 0 through 7 on the horizontal axis, representing time (t).- **Arrivals:** - At time t=0, packets 1, 2, 3, and 4 arrive. This is depicted with green and red arrows pointing downwards at their respective arrival times. - At time t=4, packets 5, 6, and 7 arrive, shown with similar arrows.- **Packet in Service:** - Below the arrivals is a shaded horizontal bar labeled "packet in service," with question marks representing the sequence of packet departures to be determined. - **Departures:** - Vertical arrows beneath the timeline indicate when packets are serviced and depart the queue.This visual aids in understanding how packets arrive and are queued for transmission under First-Come, First-Served (FCFS) scheduling.

4.2-1a. Packet scheduling (FCFS). Consider the pattern of red and green packet arrivals to a router's output port queue, shown below. Suppose each packet takes one time slot to be transmitted, and can only begin transmission at the beginning of a time slot after its arrival. Indicate the sequence of departing packet numbers (at t = 1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Give your answer as 7 ordered digits (each corresponding to the packet number of a departing packet), with a single space between each digit, and no spaces before the first or after the last digit, e.g., in a form like 7 6 5 4 3 2 1). arrivals packet in service departures 234 ? 0 1 IN 2 5 67 3 ←w 5 6 19

4.2-1a. Packet scheduling (FCFS). Consider the pattern of red and green packet arrivals to a router's output port queue, shown below. Suppose each packet takes one time slot to be transmitted, and can only begin transmission at the beginning of a time slot after its arrival. Indicate the sequence of departing packet numbers (at t = 1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Give your answer as 7 ordered digits (each corresponding to the packet number of a departing packet), with a single space between each digit, and no spaces before the first or after the last digit, e.g., in a form like 7 6 5 4 3 2 1). arrivals packet in service departures 234 ? 0 1 IN 2 5 67 3 ←w 5 6 19

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

**4.2-1a. Packet Scheduling (FCFS).**

Consider the pattern of red and green packet arrivals to a router’s output port queue, shown below. Suppose each packet takes one time slot to be transmitted, and can only begin transmission at the beginning of a time slot after its arrival. Indicate the sequence of departing packet numbers (at t = 1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Give your answer as 7 ordered digits (each corresponding to the packet number of a departing packet), with a single space between each digit, and no spaces before the first or after the last digit, e.g., in a form like 7 6 5 4 3 2 1.

**Diagram Explanation:**

- The diagram is a timeline divided into time slots, labeled 0 through 7 on the horizontal axis, representing time (t).

- **Arrivals:**
- At time t=0, packets 1, 2, 3, and 4 arrive. This is depicted with green and red arrows pointing downwards at their respective arrival times.
- At time t=4, packets 5, 6, and 7 arrive, shown with similar arrows.

- **Packet in Service:**
- Below the arrivals is a shaded horizontal bar labeled "packet in service," with question marks representing the sequence of packet departures to be determined.

- **Departures:**
- Vertical arrows beneath the timeline indicate when packets are serviced and depart the queue.

This visual aids in understanding how packets arrive and are queued for transmission under First-Come, First-Served (FCFS) scheduling.

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Step 1: Determine First-Come-First-Serve (FCFS)

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