4. Consider the switch shown below. Suppose that all datagrams have the same fixed length,that the switch operates in a slotted, synchronous manner, and that in one time slot a datagramcan be transferred from an input port to an output port. The switch fabric is a crossbar so that atmost one datagram can be transferred to a given output port in a time slot, but different outputports can receive datagrams from different input ports in a single time slot. What is the minimalnumber of time slots needed to transfer the packets shown from input ports to their output ports,assuming any input queue scheduling order you want (i.e., it need not have HOL blocking)?What is the largest number of slots needed, assuming the worst-case scheduling order you candevise, assuming that a non-empty input queue is never idle?ZYSwitchfabricOutput port XOutput port YOutput port Z

Answered: Image /qna-images/answer/628952b5-2894-4fa8-8ef3-0a432e79793b.jpg

assuming any input queue scheduling order you want (i.e., it need not have HOL blocking)? What is the largest number of slots needed, assuming the worst-case scheduling order you can devise, assuming that a non-empty input queue is never idle? ZY Switch fabric Output port X Output port Y Output port Z-

assuming any input queue scheduling order you want (i.e., it need not have HOL blocking)? What is the largest number of slots needed, assuming the worst-case scheduling order you can devise, assuming that a non-empty input queue is never idle? ZY Switch fabric Output port X Output port Y Output port Z-

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. Consider the switch shown below. Suppose that all datagrams have the same fixed length,
that the switch operates in a slotted, synchronous manner, and that in one time slot a datagram
can be transferred from an input port to an output port. The switch fabric is a crossbar so that at
most one datagram can be transferred to a given output port in a time slot, but different output
ports can receive datagrams from different input ports in a single time slot. What is the minimal
number of time slots needed to transfer the packets shown from input ports to their output ports,
assuming any input queue scheduling order you want (i.e., it need not have HOL blocking)?
What is the largest number of slots needed, assuming the worst-case scheduling order you can
devise, assuming that a non-empty input queue is never idle?
ZY
Switch
fabric
Output port X
Output port Y
Output port Z

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