22. Consider the wireless topology on the right. The solidcircles represent the transmission radius of nodes A andD, respectively, and the dashed circles represent thetransmission range of B and C. In these problems, assumeBDthat losses only occur due to collisions. list the potentialhidden terminals and exposed terminals when(i) A is transmitting to B(ii) B is transmitting to A(iii) A is transmitting to C(iv) D is transmitting to B(v) C is transmitting to B(vi) B is transmitting to C

22. Consider the wireless topology on the right. The solid circles represent the transmission radius of nodes A and D, respectively, and the dashed circles represent the transmission range of B and C. In these problems, assume that losses only occur due to collisions. list the potential hidden terminals and exposed terminals when (i) A is transmitting to B

22. Consider the wireless topology on the right. The solid circles represent the transmission radius of nodes A and D, respectively, and the dashed circles represent the transmission range of B and C. In these problems, assume that losses only occur due to collisions. list the potential hidden terminals and exposed terminals when (i) A is transmitting to B

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 following network. A. Display router forwarding table A. such that all traffic for H3 is transmittedthrough interface 3. b. May you enter a transmission table on router A, in that all traffic from HI to host H3 is transmitted via interface 3, while all traffic from 112 to host H3 is transmitted via interface 42? (Hint: This issue is a trick.)
a) Consider a CSMA/CD network running at 20 Mb/s over 3-km cable with no repeaters. The signal speed in the cable is 2×108 m/s. Suppose station A starts transmitting a frame of size 400 bytes at time T. i. Can it happen that station A detects a collision at time T+10 us (micro seconds) if there was no collision detected between time T and T+10 μs? Justify your answer. Can it happen that the station detects a collision at time T+20 μs, if there was no collision detected between time T and T+20 us? Justify your answer. iii. Can it happen that the station detects a collision at time T+33 μs, if there was no collision detected between time T and T+33 us?? Justify your answer.
Two hosts X and Y are connected by a single link. The propagation speed is 3 x 10® meters/sec. Host X sends a packet of size L = 200 bits to host Y. The propagation delay dprop is 5 ms, and it is three times of that of transmission delay dırans- i) Find the link rate R. Hint: Link rate is also called the transmission rate of the link. ii) Calculate the bandwidth-delay product. Suppose, X sends a packet of size L = 800 bits to Y. What is the number of bits that will be in the link at any given time? Explain your answer. iii)
A TCP connection is established through 10 wireless hops in an acoustic underwater ad hoc network. Assume that each hop is 100 meter in the average, acoustic signals travel 1500 meter per second, 10 kilobit data can be sent per second over a link, the source node has one megabyte of data to send, the receiver window size is 64 kilobytes, the maximum segment size is 1 kilobyte and the average processing delay for routing at each node is one millisecond. Assume also that the following segments do not reach the destination: 67, 112, 137. What would be the average utilization of the links for this connection if there is not another communications through them? Explain an alternative approach to increase the bandwidth utilization?
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1) Consider a packet of length 1200 bytes begins at end system 'A' and travels over three links to reach the destination end system 'B'. These three links are connected by two packet switches. Assuming no queuing delays, the propagation speed on all three links is 2.5*10 m/s, the transmission rates of all three links are 2 Mbps and the packet switch processing delay is 3 msec. Further, the length of the first link is 4,000 km, the length of the second link is 2,000 km, and the length of the last link is 3,000 km respectively. Specify the formula for total delay in this transmission and also calculate the end-to-end delay involved in this packet transmission?
Computer A is sending a 100 kByte long file to Computer B via packet-switching over two consecutive 10 Mbps links of 1000 km length each.Assume that the signal propagation speed on both links is 2.5 x 108 m/s.Furthermore, assume that the maximum length of a packet is 1500 bytes and that Computer A fills each packet to the max, if possible. How long (in seconds) does it take Computer A to send out one packet of maximum length on the first link?
In this problem you will be doing some elementary calculations of transmission 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 the length of the link is 100Km. Suppose now that that length of the link is doubled. What is the propagation delay from A to B now and what is the transmission time?
Consider a router that transmits bits onto a transmission medium at the rate of 2 Mbps. Let the link be 3 km in length, and bits propagate through the transmission medium at the speed of (approximately) 3x10^8 meters/sec. What is the transmission delay in seconds to transmit a packet of size 2,0o0 bits onto the link? a. 1x10^-5 seconds O b. .001 seconds с. 1 second d. -4 seconds
Assume that an end-to-end communications system is made up of three networks with date rate in Mbps ρ1, ρ2, and ρ3, respectively. Ignoring the other delay components, what is the total end-to-end delay to transmit a packet size of λ?
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.
not handwritten A 3000-km long, 1 Mbps link is used to transmit 1000-bit data packets using the Selective Repeat protocol. If the speed of light in this link is 2 x 105 km/second. What is the minimum number of bits the sequence numbers should be? Assume no flow control, and negligible transmission and processing times for acknowledgments. (Take 1M = 1000,000.)