# Recent questions tagged pure_aloha

3 votes
1 answer
1
16. In a CDMA/CD network with a data rate of 10 Mbps, the maximum distance between any station pair is found to be 2500 m for the correct operation of the collision detection process. What should be the maximum distance if we increase the data rate to 100 Mbps? To 1 Gbps? To 10 Gbps?
0 votes
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2
15. In a CDMA/CD network with a data rate of 10 Mbps, the minimum frame size is found to be 512 bits for the correct operation of the collision detection process. What should be the minimum frame size if we increase the data rate to 100 Mbps? To 1 Gbps? To 10 Gbps?
2 votes
1 answer
3
11. We have a pure ALOHA network with 100 stations. If $T_{fr} = 1 \mu s$, what is the number of frames each station can send to achieve the maximum efficiency. 12. Repeat Exercise 11 for slotted ALOHA.
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2 answers
4
Consider the delay of pure ALOHA versus slotted ALOHA at low load. Which one is less? Explain your answer.
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1 answer
5
A group of N stations share a 56-kbps pure ALOHA channel. Each station outputs a 1000-bit frame on average once every 100 sec, even if the previous one has not yet been sent (e.g., the stations can buffer outgoing frames). What is the maximum value of N?
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6
Shall I cover token passing and aloha in flow control methods in computer network. Please suggest as I don't want to waste time if it's not in syllabus. Thanks
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7
The bandwidth of a given medium for transferring the data is 100 Mbps. The user starts with pure aloha for transmission after half of the data is transferred user switched to slotted aloha. Then how much throughput will be gain or loss by the user in the second half? A 50% loss B 100% loss 100% gain D 200% gain i am getting 100% tell me what u are getting
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8
Consider 2 stations at a distance of 1 km from each other. A station transmits frames of length 100 bits at the rate of 1 Mbps. Velocity of propagation is 2 * 108 m/s. Assume that each station generates frames at an average rate of 10000 frames per second. What is the probability of collision for pure ALOHA and slotted ALOHA ?
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9
100 stations on a pure ALOHA network share a 1Mbps channel. If frames are 1000 bits long, find throughput if each station is sending 10 frames per second.
0 votes
1 answer
10
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 1000 frames per second? Please solve by mentioning step by step procedure!
0 votes
1 answer
11
A large population of ALOHA users manages to generate $50 \hspace{0.1cm} requests/sec$, including both originals and retransmissions. Time is slotted in units of $40 \hspace{0.1cm} msec$. What is the chance of success on the first attempt? What is the probability of exactly k collisions and then a success? What is the expected number of transmission attempts needed?
0 votes
1 answer
12
An aloha network user $19.2 \text{ kbps}$ channel for sending message packets of $100 \text{ bits}$ longsize. calculate the maximum throughput for pure aloha network.
3 votes
1 answer
13
Groups of user stations(N) share a 56Kbps pure aloha channel. Each station outputs a 1000 bits frame on an average of once every 100sec(stations are buffered). What is the max value of N? Answer is 1030. Please give detailed solution.
0 votes
1 answer
14
A Pure Aloha transmits 200 bits frame on a shared channel of 200 kbps.What is time required to make Frame Collision free?
2 votes
0 answers
15
I have a lot of problems to solve numericals of Aloha. In Test series they are asking such questions which i'm unable to understand. Is there any good material for it? Please provide it or explain some concepts.
1 vote
2 answers
16
A Pure ALOHA Network transmits 200 bit frames using a shared channel with 200 kbps bandwidth . If the system (all stations put together) produces 500 frames per sec , then the throughput of the system is 0.384 0.184 0.286 0.586
1 vote
3 answers
17
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