6.3-2. Multiple Access protocols (b). Consider the figure below, which shows the arrival of 6messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5,4.2, 4.6. Each transmission requires exactly one time unit.t=0.0U3Uचंn50Ut=1.06023t=2.0For the slotted ALOHA protocol, indicate which packets are successfully transmitted. You canassume that if a packet experiences a collision, a node will not attempt a retransmission of thatpacket until sometime after t=5.t=3.05t=4.06t=5.0

Pure ALOHA can be defined in such a way that it is an easy and unslotted random entry to the protocol used in information communication networks. It was developed for Ethernet networks and is one of the earliest multiple get right of entry to protocols.To determine which packets are correctly transmitted, we need to remember the subsequent:• A packet may be correctly transmitted if it's miles the simplest packet transmitted for the duration of its transmission time.• If two or greater packets are transmitted at some stage at the same time, a collision will arise and all of the packets can be destroyed.• Nodes will retransmit packets that enjoy collisions after a random quantity of time.Option 1 and 4 are correct• Packet 1: This packet is the first packet to reach and there are not any different packets within the queue at the time of its arrival. consequently, it's miles the most effective packet transmitted at some point of its transmission time and it's far correctly transmitted.• Packet 4: This packet is the second packet to arrive and the best different packet inside the queue at the time of its arrival is packet three. but, packet 3 arrives after packet 4 and therefore does no longer overlap with packet 4's transmission time. therefore, packet four is the simplest packet transmitted for the duration of its transmission time and it's far correctly transmitted.• All of the other packets experience collisions and are destroyed. Packet 2 collides with packet 3, packet 5 collides with packet 6, and packet 6 collides with itself (since it is the only packet in the queue at the time of its arrival).Option 1 and 4 are correct

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6.3-2. Multiple Access protocols (b). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5, 4.2, 4.6. Each transmission requires exactly one time unit. t=0.0 T [1] U 0 1 2 3 4 For the slotted ALOHA protocol, indicate which packets are successfully transmitted. You can assume that if a packet experiences a collision, a node will not attempt a retransmission of that packet until sometime after t=5. 5 1 9 t=1.0 23 t=2.0 t-3.0 5 t=4.0 6 t-5.0

6.3-2. Multiple Access protocols (b). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5, 4.2, 4.6. Each transmission requires exactly one time unit. t=0.0 T [1] U 0 1 2 3 4 For the slotted ALOHA protocol, indicate which packets are successfully transmitted. You can assume that if a packet experiences a collision, a node will not attempt a retransmission of that packet until sometime after t=5. 5 1 9 t=1.0 23 t=2.0 t-3.0 5 t=4.0 6 t-5.0

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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Suppose A is connected to B via an intermediate router R, as in the previous problem. The A-R link is instantaneous, but the R–B link transmits only one packet each second, one at a time (so two packets take 2 seconds). Assume A sends to B using the sliding window protocol with SWS = 4. For Time = 0, 1, 2, 3, 4, state what packets arrive at and are sent from A and B. How large does the queue at R grow?
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