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 earliest) 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 Priority scheduling, where red packets have priority over green packets. Match each time unit (t=1, t=2, t=3 ....) with the number of the packet that was transmitted and thus "departs" at that time unit.
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 earliest) 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 Priority scheduling, where red packets have priority over green packets. Match each time unit (t=1, t=2, t=3 ....) with the number of the packet that was transmitted and thus "departs" at that time unit.
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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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 earliest) 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 Priority scheduling, where red packets have priority over green packets. Match each time unit (t=1, t=2, t=3 ....) with the number of the packet that was transmitted and thus "departs" at that time unit.

Transcribed Image Text:At t=1, the number of the packet that finishes transmission is:
At t=2, the number of the packet that finishes transmission
is:
At t=3, the number of the packet that finishes transmission
is:
At t=4, the number of the packet that finishes transmission
is:
At t=5, the number of the packet that finishes transmission
is:
At t=6, the number of the packet that finishes transmission is:
At t=7, the number of the packet that finishes transmission
is:
packet 1
packet 4
packet 5
packet 2
packet 7
packet 3.
packet 6

Transcribed Image Text:arrivals
packet
in service
departures
1 234
56
???
0 1
2
3
7
???
4
???
5
6
t
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the order of arrival should be R1 G2 G3 R4 R5 G6 R7
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