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Recent questions tagged slotted_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?
asked Nov 7, 2019 in Computer Networks Mk Utkarsh 306 views
0 votes
1 answer
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?
asked Nov 7, 2019 in Computer Networks Mk Utkarsh 173 views
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.
asked Nov 7, 2019 in Computer Networks Mk Utkarsh 228 views
0 votes
0 answers
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0 votes
1 answer
5
A large population of ALOHA users manages to generate 50 requests/sec, including both originals and retransmissions. Time is slotted in units of 40 msec. (a) What is the chance of success on the first attempt? (b) What is the probability of exactly k collisions and then a success? (c) What is the expected number of transmission attempts needed?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 117 views
0 votes
0 answers
7
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
asked Dec 26, 2018 in Computer Networks Mayankprakash 169 views
0 votes
0 answers
8
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
asked Nov 9, 2018 in Computer Networks Gurdeep Saini 164 views
0 votes
0 answers
9
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 ?
asked Oct 2, 2018 in Computer Networks Mk Utkarsh 138 views
2 votes
2 answers
10
Let N station share 60 kbps of slotted aloha channel. Frame size is 1024 bits which are send at every 40 seconds. The value of N is ?
asked Sep 15, 2018 in Computer Networks Na462 1.7k views
1 vote
3 answers
11
A slotted ALOHA network transmits 200-bit frames using a shared channel with a 200 Kbps bandwidth. Find the throughput of the system (all stations put together) produces 250 frames per second: 49 368 149 151
asked Jul 13, 2018 in Computer Networks Pooja Khatri 2.6k views
0 votes
1 answer
12
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?
asked May 29, 2018 in Computer Networks Abhilash Mishra 266 views
0 votes
0 answers
13
In an infinite slotted ALOHA system the mean number of slots a station waits between a collision and a retransmission is 4. Give the relationship between the delay versus throughput of this system.
asked Apr 27, 2018 in Computer Networks hrcule 63 views
0 votes
0 answers
14
2 votes
0 answers
15
0 votes
1 answer
16
6000 stations are competing for use of single slotted aloha channel. The average station makes 30 requests/hr ,where each request is for 500 us(micro sec) duration. calculate normalized total traffic on channel
asked Jan 27, 2017 in Computer Networks Pratap 298 views
0 votes
1 answer
17
measurements of a slotted aloha channel shows that 20% of slots are idle. 1.what is normalized total traffic in channel? 2.what is normalized throughput?
asked Jan 27, 2017 in Computer Networks Pratap 538 views
2 votes
0 answers
18
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.
asked Jan 5, 2017 in Computer Networks target2017 880 views
0 votes
0 answers
20
A group of N stations share 100 Kbps slotted ALOHA channel. Each station output, a 500 bits frame on an average of 5000 ms; even if previous one has not been sent. What is the required value of N?
asked Oct 29, 2016 in Computer Networks Lone Wolf 544 views
4 votes
1 answer
21
Suppose there are 4 nodes N1, N2, N3 and N4 are using a slotted ALOHA channel to send their own huge data. When competing all the nodes to transfer their data only one node will get succeeded with a probability P. The time is divided into slots S1, S2, S3 ….and so on. What is probability of N1 succeeded in slot 5? 4*(1-P)3(P(1-P)3) P(1-P)3(1-P(1-P)3) 4*P(1-P)3(1-P(1-P)3) 4*P(1-P)3(1-P3(1-P)3)
asked Oct 25, 2016 in Computer Networks shyamalkishorejha 257 views
3 votes
1 answer
22
In a aloha implemented shared channel probability of transmission of a station in a time span of T is p. Given, probability such that NO station transmit in a time duration of $2T$ is $50\%$ , where T = one frame transmission time. What is the value of p is if total no of station = $100$
asked Jul 11, 2016 in Computer Networks dd 402 views
1 vote
3 answers
23
Consider a system generating 20 bit frames and connected through a shared 20kbps channel. Find throughput in percent if slotted ALOHA is used and frame rate is 1000 fps.
asked Jan 26, 2016 in Computer Networks Purple 11.1k views
5 votes
1 answer
24
You have two computers, $A$ and $B$, sharing a wireless network in your room. The network runs the slotted Aloha protocol with equal-sized packets. You want $B$ to get twice the throughout over the wireless network as $A$ whenever both nodes are backlogged. You configure $A$ to send packets with ... of $B$ to, in order to achieve your throughout goal? $p/(1+p)$ $p/(1+2p)$ $2p/(1+p)$ $1/2$
asked Jan 8, 2016 in Computer Networks tiger 428 views
2 votes
0 answers
25
Consider a slotted aloha channel with bandwidth 5Mbps. if frame size is equal to 10 user slots then what is effective data rate of a user if every 2nd slot is occupied by him?(Assume data if required)
asked Oct 18, 2015 in Computer Networks saurav04 448 views
8 votes
4 answers
26
A certain population of ALOHA users manages to generate 70 request/sec. If the time is slotted in units of 50 msec, then channel load would be 4.25 3.5 450 350
asked Oct 12, 2015 in Computer Networks ajit 3.7k views
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