4.2-2. Packet scheduling (FCFS). Consider the pattern of red and green packet arrivals to a router'soutput port queue, shown below. Suppose each packet takes one time slot to be transmitted, andcan only begin transmission (at the earliest) at the beginning of a time slot after its arrival. Indicate thesequence of departing packet numbers (at t=1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Match eachtime unit (t=1, t=2, t=3 ....) with the number of the packet that was transmitted and thus "departs" atthat time unit.arrivalspacketin servicedepartures1 23???????mAt t= 1, the number of the packet thatfinishes transmission is:At t=4, the number of the packet thatfinishes transmission is: [Choose ][Choose ]packet 1At t=2, the number of the packet that packet 4finishes transmission is: packet 5packet 6packet 3At t=3, the number of the packet that No packet leaves at this time.finishes transmission is: packet 2At t=5, the number of the packet thatfinishes transmission is: At t=6, the number of the packet thatfinishes transmission is: 56→At t=7, the number of the packet thatfinishes transmission is: [Choose ][Choose ][Choose ][Choose ]<<<

Packet scheduling is a critical aspect of networking, determining the order in which packets are transmitted from a router or switch's output queue. In First-Come-First-Serve (FCFS) scheduling, packets are sent in the order they arrive. This simple approach ensures fairness but may not optimize for factors like minimizing delays.Different algorithms exist to prioritize traffic based on network requirements. Effective packet scheduling is crucial for efficient and responsive communication in computer networks. Copyfish OCR Result(Auto-Detect)N/ATranslated(English)N/A -->Redo OCR Recapture Re-Translate Copy to clipboard Copyfish OCR Result(Auto-Detect)N/ATranslated(English)N/A -->Redo OCR Recapture Re-Translate Copy to clipboard Copyfish OCR Result(Auto-Detect)N/ATranslated(English)N/A -->Redo OCR Recapture Re-Translate Copy to clipboard Copyfish OCR Result(Auto-Detect)N/ATranslated(English)N/A -->Redo OCRRecaptureRe-TranslateCopy to clipboardAt t=1, only packet 1 has arrived, so it departs.At t=2, packet 2 and packet 3 have arrived, but packet 2 is the first in the queue, so it departs.At t=3, packet 3 departs since it's next in line.At t=4, both packets 4 and 5 have arrived, but packet 4 is first in line, so it departs.At t=5, packet 5 departs.At t=6, packet 6 departs.At t=7, there are no new arrivals, so no packet departs.So the sequence is:At t=1, packet 1 departs.At t=2, packet 2 departs.At t=3, packet 3 departs.At t=4, packet 4 departs.At t=5, packet 5 departs.At t=6, packet 6 departs.At t=7, no packet departs.At t=1, the number of the packet that finishes transmission is: packet 1Explanation: At time t=1, only packet 1 has arrived, so it is the only packet that can depart.At t=2, the number of the packet that finishes transmission is: packet 2Explanation: At time t=2, packet 2 and packet 3 have arrived. According to FCFS (First-Come-First-Serve) scheduling, packet 2, which arrived first, departs.At t=3, the number of the packet that finishes transmission is: packet 3Explanation: At time t=3, packet 3 departs as it is the next in line based on FCFS.At t=4, the number of the packet that finishes transmission is: packet 4Explanation: At time t=4, both packets 4 and 5 have arrived. Packet 4, being the first in the queue, departs.At t=5, the number of the packet that finishes transmission is: packet 5Explanation: At time t=5, packet 5 departs as it is the next in line.At t=6, the number of the packet that finishes transmission is: packet 6Explanation: At time t=6, packet 6 departs, being the next in line.At t=7, the number of the packet that finishes transmission is: No packet leaves at this time.Explanation: At time t=7, no new packets have arrived, so no packet departs.ConclusionMatching the options:At t=1, the number of the packet that finishes transmission is: packet 1At t=2, the number of the packet that finishes transmission is: packet 2At t=3, the number of the packet that finishes transmission is: packet 3At t=4, the number of the packet that finishes transmission is: packet 4At t=5, the number of the packet that finishes transmission is: packet 5At t=6, the number of the packet that finishes transmission is: packet 6At t=7, the number of the packet that finishes transmission is: No packet leaves at this time.

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4.2-2. 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 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 FCFS scheduling. 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. arrivals packet in service departures 23 ??????? IN ←w/ At t=1, 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: 56 [Choose ] [Choose] packet 1 At t=2, the number of the packet that packet 4 finishes transmission is: packet 5 packet 6 packet 3 At t=3, the number of the packet that No packet leaves at this time. finishes transmission is: packet 2 At t-7, the number of the packet that finishes transmission is: 5 [Choose ] [Choose ] [Choose ] 16 [Choose ]

4.2-2. 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 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 FCFS scheduling. 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. arrivals packet in service departures 23 ??????? IN ←w/ At t=1, 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: 56 [Choose ] [Choose] packet 1 At t=2, the number of the packet that packet 4 finishes transmission is: packet 5 packet 6 packet 3 At t=3, the number of the packet that No packet leaves at this time. finishes transmission is: packet 2 At t-7, the number of the packet that finishes transmission is: 5 [Choose ] [Choose ] [Choose ] 16 [Choose ]

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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Phases of TCP congestion control. Consider the figure below, which plots the evolution of TCP's congestion window at the beginning of each time unit (where the unit of time is equal to the RTT); see Figure 3.53 in the text. In the abstract model for this problem, TCP sends a "flight" of packets of size cwnd at the beginning of each time unit. The result of sending that flight of packets is that either (i) all packets are ACKed at the end of the time unit, (ii) there is a timeout for the first packet, or (iii) there is a triple duplicate ACK for the first packet. Congestion window size (in segments) 40 35 30 25 20 15 10 5 0 www 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Time unit (in RTT) A. During which of the following intervals of time is TCP performing slow start*? B. During which of the following intervals of time is TCP performing congestion avoidance*? C. At the end of which units of time does TCP detect a triple-duplicate-ACK*?…
4.2-2b Packet scheduling (PRI). Consider again the same pattern of red and green packet arrivals to a router's output port queue, as shown above (in question 4.2-2a). 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. At t=1, the number of the packet that finishes transmission is: [Choose ] [Choose ] packet 6 packet 5 At t-3, the number of the packet that No packet departs at this time unit. finishes transmission is: packet 2 At t=4, the number of the packet that packet 4 finishes transmission is: packet 1 At t=2, 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…
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TCP?
Consider that only a single TCP (Reno) connection uses one 10Mbps link which does not buffer any data. Suppose that this link is the only congested link between the sending and receiving hosts. Assume that the TCP sender has a huge file to send to the receiver, and the receiver's receive buffer is much larger than the congestion window. We also make the following assumptions: each TCP segment size is 1,500 bytes; the two-way propagation delay of this connection is 150 msec; and this TCP connection is always in congestion avoidance phase, that is, ignore slow start. A. What is the maximum window size (in segments) that this TCP connection can achieve? B. What is the average window size (in segments) and average throughput (in bps) Of this TCP connection? C. How long would it take for this TCP connection to reach its maximum window again after recovering from a packet loss?
as a possible congestion control mechanism in a subnet using virtual circuits internally, a router could refrain from acknowledging a received packet until (1) it knows its last transmission along the virtual circuit was received successfully and (2) it has a free buffer. for simplicity, assume that the routers use a stop-and-wait protocol and that each virtual circuit has one buffer dedicated to it for each direction of traffic. if it takes 7 sec to transmit a packet (data or acknowledgement) and there are n routers on the path, what is the rate at which packets are delivered to the destination host? assume that transmission errors are rare and that the host-router connection is infinitely fast.
Packet scheduling. Consider the same 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 round robin scheduling. Assume a round-robin scheduling cycle begins with green packets. 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). [Note: You can find more examples of problems similar to this here.] arrivals packet in service departures 1 234 0 5 2 67 ??????? 3 4 5 6
Consider the same 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 round robin scheduling. Assume a round-robin scheduling cycle beings with green packets. 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).
Packet scheduling. 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 5 2 ???? ? 67 3 4 5 6 t
1. Consider a path from host A to host B through a router X as follows: A- -X-B The capacity of the link AX is denoted Ra, while the capacity of the link XB is denoted Rb in units of [bits/s]. Assume that Ra Ri. Is it possible that the second packet queues at input queue of the second link? Explain. Now suppose that host A sends the second packet T seconds after sending the first packet. How large must T be to ensure no queueing before the second link? Explain.
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.
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 21). arrivals packet in service departures 0 234 ???? ? ? ? ? IN 5 67 2 3 1+ ??? 5 ←s 6