1. A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps.What is the throughput if the system(All stations together)produces 100 frame per second.
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1. A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps.What is the throughput if the system(All stations together)produces 100 frame per second.
(Hints:44.5; 10.5)
2. what is the vulnerable time frame size of pure ALOHA?If the time unit is P then find it out.[Hints: 2P;0.2P]
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- Frames of 1000 bits are sent over a 106 bps duplex link between two hosts. The propagation time is 25 ms. Frames are to be transmitted into this link to maximally pack them in transit (within the link). 1.1 What is the minimum number of bits (1) that will be required to represent the sequence numbers distinctly? Assume that no time gap needs to be given between transmission of two frames.We have a 1000 m long 10 Mbps communication channel with ARQ protocol. The signal travels at a speed of 2 ∗ 10 ^ 8 ? / ?Assume that no frame is lost or damaged. Confirmation frames, control information are negligible in size.For what range of frame sizes do we get an efficiency of at least 70%?Consider a full-duplex 256 Kbps satellite link with a 240 millisecond end-to-end delay. The data frames carry a useful payload of size 12,000 bits. Assume that both ACK and data frames have 320 bits of header information, and that ACK frames carry no data. What is the effective data throughput When using sliding windows with a sender window size of W = 5 data frames?
- Suppose you are designing a sliding window protocol for a 1-Mbps point-to-point link to the stationary satellite revolving around the Earth at an altitude of 3 × 104 km. Assuming that each frame carries 1 KB of data, what is the minimum number of bits you need for the sequence number in the following cases? Assume the speed of light is 3 × 108 m/s. (a) RWS=1 (b) RWS=SWSAssume that there is a shared connection (for example, an Ethernet bus) with a speed of 1 Mbps. How much time (in microseconds) is required to send a frame with a length of 1000 bits over this link?Suppose we have a reservation system with 50 users, frame transmission time of 0.6 sec, v = 0.3. (a) What is the effective frame transmission time? (b) What is the efficiency/throughput if all stations are transmitting? (c) What is the efficiency/throughput if a minislot can reserve up to 7 frames?
- Consider the following scenario: Frames of 12000 bits are sent over a 400kbps channel using a satellite whose propagation delay is 270ms. Acknowledgements are always piggybacked onto data frames. (That is, in the case of stop-and-wait, the next frame cannot be transmitted until the entire frame containing the acknowledgement is received.) Five-bit sequence numbers are used. What is the maximum achievable channel utilization for (a) Stop-and-wait. (b) Protocol 5 (i.e., Go Back N). (c) Protocol 6 (i.e., Selective Repeat)A communication satellite orbits the earth at distance of 30000 miles with each mile having a propagation speed of 5 x 10^(-6) seconds. The data rate of the satellite link is 1 Mb/s. Suppose a data frame is 1250 bytes and that ACKs have negligible processing and transmission times. With the Stop-and-Wait protocol, what is the maximum utilization possible.Discuss ways in which the utilization can be improved. Remember that the satellite is far away and therefore outline the disadvantages to any scheme you propose that may improve the utilization.Assume that the propagation speed in a coaxial cable is 2 ∙108 m/s a. Packets are transmitted using the ABP (alternate bit protocol) over a full-duplex 5-km coaxial cable with a 5 Mbps transmission rate. The packets and ACKs are 1500 bits long. The transmitter and receiver use a CRC chip and their processing time is negligible. How many packets are transmitted every second when there is no transmission error? b. Five transmission lines identical to the one discussed in a) are connected in series. A buffer is used at each connection between the links to store packets as required. How many packets will go through the five lines every second when there are no transmission errors? Now assume that a packet or its acknowledgement is corrupted on any given link with probability p. What is the new packet transmission rate through the five links? Comment. Assume the processing delays and queuing delays for both ends are negligible.
- 2. Consider a bus-topology network with five stations. A reservation access method is used. Each station has infinite data to transmit. Each reservation slot has 10 microseconds (note that 1 microsecond = 106 second). For each station, one data transmission sends 1000 bits. The transmission rate over the medium is 10 Mbps. For a station, which is its throughput (in unit "Mbps")?A 1 Mbps link is used to transfer packets of each 10,000 bits long. This includes 500 bits header. If the channel is error free and 270 msec is the signal propagation time from the source to destination, obtain the efficiency for, (1) Stop and wait protocol. (i) Sliding window protocol with window size of 500. (iii) Sliding window protocol with window size of 10.Suppose you are designing a sliding window protocol for a 1-Mbps point-to-point link to a stationary satellite revolving around the earth at 3 x 104 km altitude. Assuming that each frame carries 1 KB of data, what is the minimum number of bits you need for the sequence number in the following cases? Assume the speed of light is 3 x 108 m/s. (a) RWS=1 (b) RWS=SWS