Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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ed
ers
Packet scheduling (Scenario 1, Priority). 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, 7, 8) under priority scheduling, where red packets have higher priority.
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
1234576
1235476
t
1 2 3 4 5
Į
??
0 1
? ? ?
67
??
2 3 4 5 6 7 8
Not quite. One of more of your packets are in the incorrect order.
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Transcribed Image Text:ed ers Packet scheduling (Scenario 1, Priority). 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, 7, 8) under priority scheduling, where red packets have higher priority. 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 1234576 1235476 t 1 2 3 4 5 Į ?? 0 1 ? ? ? 67 ?? 2 3 4 5 6 7 8 Not quite. One of more of your packets are in the incorrect order.
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