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…

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

See similar textbooks

Similar questions

Suppose N 4 and the reliable data transfer protocol is Selective Repeat. Assume that the sequence number space is set appropriately, i.e., it is at least 2N = 8. Suppose at time t, the rcvbase is 5 at the receiver. True or false: the receiver can receive a packet of sequence number 1 at time t, and in that case, it should send ack1. Briefly justify your answer.
. Consider a packet of length L that begins at end system A and travels over three links to a destination end system. These three links are connected by two packet switches. Let di, si, and Ridenote the length, propagation speed, and the transmission rate of link i, for i=1,2,3. The packet switch delays each packet by dproc. Assuming no queuing delays, in terms of di, si, Ri, (i=1,2,3), and L, what is the total end-to-end delay for the packet? Suppose now the packet is 1,500 bytes, the propagation speed on all three links is 2.5-108m/s, the transmission rates of all three links are 2 Mbps, the packet switch processing delay is 3 msec, the length of the first link is 5,000 km, the length of the second link is 4,000 km, and the length of the last link is 1,000 km. For these values, what is the end-to-end delay?
PLZ AS FAST AS POSSIBLE I WANT THE SOLUTION OF THIS QUESTION A pipeline protocol is used between a sender and a receiver. The sender wants to send 6 packets with a rate 1packet/1ms. The propagation time is 3 ms for any packet and the time out is 8 ms. The time for processing packet and the transmission time are negligible. Assume that Selective Repeat is used, window size is 3 and the packet with sequence number 2 is lost (start sequence number from 0) a. Fill up the below figure with information about sending packet from sender to receiver and ACK packet in reverse direction. b. Calculate the total time required in c. order the receiver receives the 6 packets correctly. Specify the number of data packets and acknowledgments sent and sequence number of data packets and acknowledgments. Receiver H Sender Ims
15. Consider the following plot of TCP window size as a function of time (y axis is the congestion window size (segments), and x axis is the transmission round). Assuming that TCP Reno is the protocol experiencing the behavior shown above, answer the following questions. 18 16 14 12 10 00 8 6 4 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1) Identify the intervals of time when TCP slow start is operating. 2) After the 5th transmission round, is segment loss detected by a triple duplicate ACK or by a timeout? 3) What is the value of Threshold at the 7th transmission round? 4) What is the value of Threshold at the 15th transmission round?
In protocol 6, the code for frame arrival has a section used for NAKs. This section is invoked if the incoming frame is a NAK and another condition is met. Give a scenario where the presence of this other condition is essential.
Using packet tracer, implement a network that has the following components: 1- At least five routers 2- At least 7 subnets 3- At least 12 PCs 4- At least 4 switches 5- Use RIP routing protocol To assign IP addresses of the routers and PCs, use the IP address from your ID as follows Assume your id is 118zyxw, Consider the numbers z, y, x and w as deciemal You have the subnet 118.0.0.0/24 If your ID is 1181234 then the IP is 118.0.0.0/24 Use this subnet to get at least 7 subnets.
2. Consider a slotted TDM hierarchical network in which there are 8 computers sharing a 10 Mbps channel to a router R1, sending packets to R1 which must all be forwarded by R1 over an outgoing link (called the MAN link), as shown in Figure 1. Computers A-H always have packets waiting to be sent, so no timeslot on the shared LAN is idle. Ignore the propagation delay on the LAN. The MAN link outgoing from R1 is a 100 Mbps link. The network layer protocol in use has a PDU with exactly 40 bytes of header and exactly 200 bytes of payload (SDU). The DLC layer protocol in use on the LAN has a PDU with exactly 40 bytes of header and 20 bytes of trailer. The DLC layer protocol in use on the outgoing link from R1 has a PDU with 40 bytes of header and no trailer. The physical layer does not impose any bit overhead in either channel. Use 1 Mbps = 1000000 bps. B D E F G H R1 R2 Figure 1 (a) What is the transmission delay of a bit for Computer A? (b) What is the transmission delay of a DLC PDU for…
Question 1 Consider in the SW-ARQ protocol a packet can at most be retransmitted for 5 times, before it is discarded/destroyed. Find the transition matrix P and all the performance metrics for this SW-ARQ protocol, also find the packet loss probability.
6.3B-4. Multiple Access protocols (4). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. t=0.0 1 U r 1 U 3 2 4 Again consider the CSMA protocol (without collision detection), indicate those packets where the channel is sensed busy and therefore, under CSMA, that message transmission is not attempted. [Again, you should assume that it takes .2 time units for a signal to propagate from one node to each of the other nodes. You can assume that if a packet experiences a collision or senses the channel busy and that that node will not attempt a retransmission of that packet until sometime after t=5. Hint: consider propagation times carefully here]. 5 2 3 a t=1.0 t=2.0 4 t=3.0 56 t=4.0 t=5.0
3.4-7 Stop-and-wait: channel utilization. Suppose a packet is 10K bits long, the channel transmission rate connecting a sender and receiver is 10 Mbps, and the round-trip propagation delay is 10 ms. What is the maximum channel utilization of a stop-and-wait protocol for this channel?
In this problem you will be doing some elementary calculations oftransmission and propagation delays.Consider two hosts, A and B that are connected by a transmissions link of2.1 Mbps. Assume that packets are of length 2.0 Kb (Kilobits) and thelength of the link is 100Km. a). Now suppose that node C is connected to node B also by a 2 Mbps, 100Km link. How long does it take from when the first bit is transmitted by Ato when the last bit is received at C, assuming B operates in a store-andforward manner?