6.3A-1. Multiple Access protocols (1). Consider the figure below, which shows the arrival of 6messages for transmission at different multiple access wireless nodes at times t=0.1, 1.4, 1.8, 3.2,3.3, 4.1. Each transmission requires exactly one time unit.t=0.0Oo1Oo123For the pure ALOHA protocol, indicate which packets are successfully transmitted. You can assumethat if a packet experiences a collision, a node will not attempt a retransmission of that packet untilsometime after t=5.45t=1.092t=2.045t=3.06t=4.0t=5.0

Aloha System transmission is a protocol that is used to transfer data from one node to the other.…

6.3A-1. Multiple Access protocols (1). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 1.4, 1.8, 3.2, 3.3, 4.1. Each transmission requires exactly one time unit. 1 t=0.0 t=1.0 2 3 t=2.0 45 t-3.0 6 t=4.0 t=5.0 For the pure 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.

6.3A-1. Multiple Access protocols (1). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 1.4, 1.8, 3.2, 3.3, 4.1. Each transmission requires exactly one time unit. 1 t=0.0 t=1.0 2 3 t=2.0 45 t-3.0 6 t=4.0 t=5.0 For the pure 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.

A+ Guide To It Technical Support

10th Edition

ISBN:9780357108291

Author:ANDREWS, Jean.

Publisher:ANDREWS, Jean.

Chapter8: Network Infrastructure And Troubleshooting

Section: Chapter Questions

Problem 8TC

See similar textbooks

Similar questions

The maximum packet size (Maximum Transmission Unit or MTU) of an IP packet including IPv4 header on 100 Mbps Ethernet is usually set at 1500 bytes. A typical IPv4 header consists of 20 bytes, and a UDP header consists of 8 bytes. If we split up a file of 20,000,000 bytes so we can send it as a series of UDP payloads, how many IP packets do we have to send in order to transfer the entire file? Enter an integer number without formatting (no commas). Answer: The MTU for IP packets on 100 Mbps Ethernet is typically set to 1500 bytes. A typical IPv4 header consists of 20 bytes, and a UDP header consists of 8 bytes. If we split up a file of 25,000,000 bytes so we can send it as a series of UDP payloads, how many bytes do we have to send at the network layer in order to transfer the entire file? Enter an integer number (no commas). Answer: You are sending a 27,000,000 byte file using UDP over IP over an Ethernet with MTU 1500 bytes. The Ethernet header is 14 bytes and the frame checksum is 4…
Consider a network with 4 links between two hosts where the maximum allowable packet size is 1000 bits; each link has a transmission rate of 2000 bits per second, except the second link has a transmission rate of 1000 bits per second. How long does it take to send 6000 bits from one host to the other? You may ignore propogation delay, assume there is no other traffic on the network, and assume that no routers drop packets due to queue length. Round your answer to two decimal places.
The maximum packet size (Maximum Transmission Unit or MTU) of an IP packet including IPv4 header on 100 Mbps Ethernet is usually set at 1500 bytes. A typical IPv4 header consists of 20 bytes, and a UDP header consists of 8 bytes. If we split up a file of 20,000,000 bytes so we can send it as a series of UDP payloads, how many IP packets do we have to send in order to transfer the entire file? Enter an integer number without formatting (no commas). Answer:
Consider the rdt3.0 protocol. Draw a timing diagram showing that if the network connection between sender and receiver can reorder messages, i.e., that two messages propagating in the medium between the sender and receiver can be reordered, then rdt3.0 will not work correctly. Referring to the diagram, clearly explain why this is the case.
Question 7 Consider the Go-back-N protocol with a sequence number space {0,1,2,3} and a window size N=3, and suppose that the sender wants to send 7 packets in total (excluding retransmissions), where the first packet sent will get sequence number 0. Assume that the 2-nd packet sent by the sender as well as the first ACK with a sequence number of 2 are both lost. All other messages arrive within 1 unit of time, and the sender uses a timeout value of 4 time units before initiating a retransmission. You can assume that the sender sends all packets as soon as possible and we neglect the transmission delay. • List all sequence numbers in the exact order in which they arrive at the receiver. (Note that this includes sequence numbers of packets sent in retransmission.) • What are the values of the send_base and the rcv_base variables after the sender has received the ack for its final packet?
MULTIPLE ACCESS PROTOCOLS: COLLISIONS Consider the figure below, which shows the arrival of 12 messages for transmission at different multiple access wireless nodes at times t = and each transmission requires exactly one time unit. t=0.0 Answer t=1.0 3 NA € t=2.0 . t=3.0 2 t=4.0 QUESTION 1 OF 2 Suppose all nodes are implementing the Aloha protocol. For each message, indicate the time at which each transmission begins. Separate each value with a comma and no spaces. 12 t=5.0
Consider this multihpop network running the 802.11 MAC protocol in ad-hoc mode (RTS-CTS-DATA-ACK) and a link speed of 1 Mbps: A === B === C === D Edges ‘===’ represent connectivity, so, for instance, nodes B and C can communicate with each other directly, but A and C cannot. All nodes are able to route packets on behalf of the other nodes and they employ store-and-forward to deliver packets to the destination. Suppose nodes A, B, and C have to send a lot of data frames to node D and have their link layer queue always full. What is the average data rate for A, B, and C assuming no DATA frames get lost due collisions? Explain your answer. Compare the data rates with the link rate.
Consider a channel that can lose packets but has a maximum delay that is known. Modify protocol rdt2.1 to include sender timeout and retransmit. Informally argue why your protocol can communicate correctly over this channel.
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 answer.
Assume that a Host A contacts a name server B to get a cached DNS response (i.e., B does not have to go to the root name server, TLD name server, or authoritative name server to get a response). Suppose that A and B can communicate using UDP or TCP. However, any packet sent from A to B or from B to A has an independent chance of being lost of 10%. Let the round trip time for a packet to go from A to B and back (or B to A and back) be RTT. Let A start at a time = 0s. When the time is 2RTT, which of TCP or UDP is the better option for A to get the DNS response from B? Better here means higher probability of correctly receiving the DNS response
Suppose that a router receives simultaneously 3 packets (pkt1, pkt2, and pkt3) with length L1 = 1 Kbit, L2 = 8 Kbit, and L3 = 4 Kbit, respectively. The three packets are to be forwarded through the same link with transmission rate R = 4 Mbps. Packets are to be forwarded in the following order: pk1, pkt2, pkt3. R 1. What is the queueing delay of pkt1? 2. What is the queueing delay of pkt2? 3. What is the queueing delay of pkt3? 4. What is the average queueing delay at router R?
Connection-based protocols could be replaced by connectionless protocols. Look at the pros and cons of each to decide which one is best.