P1: Consider the slotted ALOHA protocol. Suppose that there are N devices that want to transmit. What s the optimal access probability (p) that maximizes the total throughput? P2: Following P2, when N -> 00, what is the maximum throughput that can be achieved using slotted ALOHA?
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- If there are x number of devices that are wanting to transmit during a slotted Aloha protocol, what value of access probability (p) will maximize the amount of total throughput for the system? Also what happens to the value of throughput as the number of devices approaches infinity?Pure ALOHA is used in a network with Poisson distributed traffic. The success probability, as defined in this given with P(successful access) = 0.05.a) How large is the normalised channel access rate G, and the normalised success rate S (alsosometimes called throughput)?b) From now, the maximum data rate C is considered with C = 96 kbit/s = 96·103 bit/s. Allpackets that are transmitted have a size of 64 byte and every sender in the network sends3 packets per minute on average. What is the average access rate g1 of a single sender?What is the average access rate g and the normalised access rate G on the channel if there are 50, 500, and 5000 senders connected?c) With the same values of part (b) above, what are the normalised success rates S50, S500, S500in the case of 50, 500, and 5000 senders?4.) Suppose that a sender and a receiver are using ARQ to perform reliable data delivery. If we have to send 12 packet and window size of 4 , if every 5 th packet is being transmitted is lost, then how many retransmissions and total number of transmissions are required? (7) a. GoBack-N b. Selective Repeat
- 1.4.12.2 End-to-end Delay. Consider again the network shown above. The links again have transmission rates of R1 = R2 = 100 Mbps (i.e., 100 x 106 bits per second), and each packet is 1 Mbit (106 bits) in size. Assume that the propagation delay is 1 msec per link. What is the end-to-end delay of a packet from when it first begins transmission at the sender, until it is received in full by the server at the end of the rightmost link. Assume store-and forward packet transmission. You can assume the queueing delay is zero. Answer choices: A. 2 x 106 msec b. 2.01 msec C. 1.1 msec D. 2.02 msec 1.4.12.3 Maximum Throughput. Consider again the network shown above. The links again have transmission rates of R1 = R2 = 100 Mbps Assume that the link R2 is fairly shared (as we've seen is done via TCP) between the two sessions. What is the maximum end-to-end throughput achieve by each session, assuming both sessions are sending at the maximum rate possible? Answer choices:…2. Question; Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and suppose the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B. Express the propagation delay, ????? , in terms of m and s. Determine the transmission time of the packet, ?????? , in terms of L and R. Ignoring processing and queuing delays, obtain an expression for the end-to-end delay. Suppose , ? = 2?10^8 ?/?, ? = 5 ????? and ? = 100???? Find the distance m so that ????? equals ??????.Consider a slotted ALOHA network with three nodes that always have packets to send. Suppose one of the nodes requires a mean throughput of at least 0.3 packets per slot, and that it contends for slots with probability 0.45. Suppose that one of the other nodes contends for slots with probability 0.1. What is the maximum contention probability for the third node, without violating the throughput requirement of the first node? Already answered but want a detailed answer. Please don't copy paste
- Consider a short, 10-meter link, over which a sender can transmit at a rate of 150 bits/sec in both directions. Suppose that packets containing data are 100,000 bits long, and packets containing only control (e.g., ACK or handshaking) are 200 bits long. Assume that N parallel connections each get 1/N of the link bandwidth. Now consider the HTTP protocol, and suppose that each downloaded object is 100 Kbits long, and that the initial downloaded object contains 10 referenced objects from the same sender. Would parallel downloads via parallel instances of non-persistent HTTP make sense in this case? Now consider persistent HTTP. Do you expect significant gains over the non-persistent case? Justify and explain your answerHow is the cost/metric of a route determined in OSPF. Then, let's say that for a packet to get to a destination, it passes over the following 5 networks: Gigabit LAN, 100 Meg connection to ISP, 10 Gigabit ISP network, 10 Megabit ISP connection at remote end, and Gigabit LAN. Calculate the cost of this total route.Consider a wireless network. For each of the following cases, state whether the packet transmission would be successful; assume no collision avoidance. Explain your answers. 2.2.2 Nodes A and B are in range of each other; nodes B and C are in range of each other; A and C are not in range of each other. C is transmitting and A wants to send a packet B
- This elementary problem begins to explore propagation delay andtransmission delay, two central concepts in data networking. Consider two hosts, Aand B, connected by a single link of rate R bps. Suppose that the two hosts areseparated by m meters, and suppose the propagation speed along the link is smeters/sec. Host A is to send a packet of size L bits to Host B.a. Express the propagation delay, ????? , in terms of m and s.b. Determine the transmission time of the packet, ?????? , in terms of L and R.c. Ignoring processing and queuing delays, obtain an expression for the end to-enddelayCan someone help me with this question please? ASAP??!!! 6. Consider a packet of length L which 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 Ri denote the length, propagation speed, and the transmission rate of link i, for i = 1, 2, 3. The packet switch delays each packet by dproc. a. 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? (10 Points) b. Suppose now the packet is 1,500 bytes, the propagation speed on all three links is 2.5×108 m/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? (15 Points)This elementary problem begins to explore propagation delay andtransmission delay, two central concepts in data networking. Consider two hosts, Aand B, connected by a single link of rate R bps. Suppose that the two hosts areseparated by m meters, and suppose the propagation speed along the link is smeters/sec. Host A is to send a packet of size L bits to Host B. d. Suppose Host A begins to transmit the packet at time t=0 . At time t= ?????? ,where is the last bit of the packet? e. Suppose ????? is greater than ?????? . At time t= ??????, where is the first bit of the packet?f. Suppose ????? is less than ??????. At time t= ?????? , where is the first bit of thepacket?