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Recent questions tagged csma-cd

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31

home work
A building running CSMA–CD protocol is having a bandwidth of 512Mbps and distance of 2 kilometres then determine the minimum data size in order to detect a collision. Assume that the signal speed is 2,00,000km/s 1000bytes 1250bytes 1280bytes 1024bytes

Samaa.qudah asked in Computer Networks Nov 29, 2018

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32

geeksforgeeks
Suppose that the one-way propagation delay for a 100 Mbps Ethernet having 48-bit jamming signal is 1.04 micro-seconds. The minimum frame size in bits is: 112 160 208 256

Ashish Goyal asked in Computer Networks Nov 26, 2018

by Ashish Goyal

1.2k views

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33

Computer Networks - Csma Cd
If CSMA transmits 8 stations network data in single channel whats is the chip code for station 5 {Assume that W1=[+1]} how to solve it solution given is. 1111-1-1-1-1.

Divyanshum29 asked in Computer Networks Oct 30, 2018

by Divyanshum29

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34

jamming signal
Consider two node A and B on the same ethernet segment and suppose the propagation delay between the node is 225-bit times. Suppose at the time both node A and B begin to transmit a frame. Assume both nodes transmit a 50-bit jam signal after detecting a collision. For 10^7 bits per sec ethernet, the time at which both nodes A and B sense an idle channel is __microsec

shubham6596 asked in Computer Networks Oct 27, 2018

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35

Self doubt
In CSMA CD: 1) Before starting transmission of frame station sense COMPLETE carrier or only its connection point ? example : if D is transmitting frame to E WIll A sense carrier as idle or busy 2) Lets take At time t = 5 Station A wants to send ... to send frame to E . WIll it be possible simultaneously ? Does detecting channel idle by two stations ALWAYS imply collision will happen ?

jatin khachane 1 asked in Computer Networks Sep 21, 2018

by jatin khachane 1

216 views

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36

Kurose and Ross || Link Layer and Local Area Networks
Suppose that a wireless link layer using a CSMA-like protocol backs off 1ms on average. A packet's link and physical layer headers are always set at the same bitrate and take a total of 125us to transmit. If a packet is sent ... up by backoff and link/physical layer headers. Can someone help me out and explain the solution. I'm stuck here.

Phantom5 asked in Computer Networks Aug 31, 2018

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37

ME_Test_CSMA/CD
I was not convinced by the solution provided so, I made my own analysis. Given propagation delay is 225-bit times, and since bandwidth is $10^7 bps$, so my $T_p=22.5 \mu s$ Suppose at t=0, both A and B start to transmit. At t=$22.5 \mu s$, both A and B will detect ... both A and B. Now, my question is whether at t=$51 \mu s$ my channel would look idle to A and B or at $50 \mu s$ ?

Ayush Upadhyaya asked in Computer Networks Aug 14, 2018

by Ayush Upadhyaya

194 views

1 vote

1 answer

38

Made Easy Workbook - Computer Network
The round trip propagation delay for a 100Mbps Ethernet having 48-bit jamming signal is 64 ms. What is the minimum frame size (in bytes)?

Sumit Singh Chauhan asked in Computer Networks Aug 7, 2018

by Sumit Singh Chauhan

1.6k views

2 votes

1 answer

39

RPSC Programmer Exam 2013
A local area network operates Ethernet with CSMA/CD mechanism and runs at a transmission rate of 8 Mbps and a one-way signal propagation time of 25 microseconds. How long has a station to wait before trying to access the channel again, after experiencing 5 successive collisions? 1. 125 microseconds. 2. 625 microseconds 3. 800 microseconds 4. 1600 microseconds.

irfan119 asked in Computer Networks Aug 5, 2018

621 views

4 votes

2 answers

40

MADE EASY TEST SERIES
Assume that X and Y are the only two stations on an Ethernet. Each has a steady queue of frames to send. Both X and Y attempt to transmit a frame, they wait to get the control of channel using binary exponential algorithm. The probability that both ... fifth round of the algorithm (assuming every time both X and Y will collide in back-off race till 4th round) is ________.

smsubham asked in Computer Networks Jan 25, 2018

1.0k views

2 votes

1 answer

41

computer-networks csma-cd
Consider CSMA/CD LAN with bandwidth 10 Mbps and propagation delay of 5 μsec. Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum and other overhead. The first bit slot after a successful ... . The effective data rate of the network is ________ (in Mbps). (Excluding overhead, assuming that there are no collisions)

rajoramanoj asked in Computer Networks Jan 17, 2018

1.1k views

2 votes

2 answers

42

CSMA/CD
In standard ethernet with transmission rate of 20 Mbps, the length of the cables is 2500 m and the size of frame is 512 bits. The propagation speed of a signal in a cable is 2 × 108 m/s. The percentage of the time channel is idle or not used by a station is _________ (in approximate integer value).

VS asked in Computer Networks Jan 6, 2018

by VS

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43

CSMA/CD
Consider CSMA/CD LAN with bandwidth 10 Mbps and propagation delay of 5 μsec. Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum and other overhead. The first bit slot after a successful transmission is ... overhead, assuming that there are no collisions) (Upto 2 decimal places) Here I am getting 5.98Mbps,can anyone confirm this.

junaid ahmad asked in Computer Networks Dec 20, 2017

by junaid ahmad

287 views

1 vote

1 answer

44

Total time in Transmission Between two stations
A simple network consist of two nodes X and Y. Each node has a single frame of F = 1500 bits (including all header and preambles) to send to each other. Both nodes attempt to transmit at t = 0'. In case that a node executes the exponential Back-off ... TT + PT. And TT = 10 μs and PT = 4 μs, and thus it is total 36μs. but the answer given is 26μs.

Shubhanshu asked in Computer Networks Dec 18, 2017

758 views

1 vote

1 answer

45

Why does Jamming signal not collide ?
Hi Guys, In Ethernet whenever collision happens station sends a Jamming signal. But why does these special signal not collide ? In many question i saw they also have TT and TP. So what does make them collision free ? PS: Refer Problem 2 on http://web.eecs.umich.edu/~zmao/eecs489/MT2/mt2reviewHints.pdf

Chhotu asked in Computer Networks Dec 16, 2017

by Chhotu

1.9k views

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46

CSMA/CD
1. To transmit and receive digital data between islands using the CSMA / CD multiple access protocol do. As shown in the picture below, the distance between any two islands is 10km . Each island has a digital transceiver compliant with the CSMA / CD protocol. It ... At this time, the retransmitted islands How long do you want to wait and start sending again? Of course, CSMA / CD protocol.

khjkhj1212 asked in Computer Networks Dec 16, 2017

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47

Ethernet's multiple access protocol(CSMA/CD)
I have question for CSMA/CD assume, 1. Node : 7 nodes(A,B,C,D,Y,X,Z) 2. maximum distance : 10 km (A to Z is 10km, rests are below 10km) 3. transmission speed : 10Mbps Q1. The distance between Node A and Node Z is 10 ... At this time, the retransmitted islands How long do you want to wait and start sending again? Of course, CSMA / CD protocol. Thank you

khjkhj1212 asked in Computer Networks Dec 16, 2017

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48

CSMA/CD
What is contention window for CSMA/CD? What is it's difference with persistence method?

srestha asked in Computer Networks Dec 9, 2017

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1 vote

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Pawan Kumar 2 asked in Computer Networks Nov 20, 2017

by Pawan Kumar 2

281 views

1 vote

1 answer

50

CSMA/CD
Consider a network consists of 4 interconnected nodes, P,Q,R,S. Distance between them are follows:PQ=254km, PR=243km,PS=287km, QR=239km , QS=300km, RS=120km. The network uses CSMA/CD and signal travels at a speed $2\times 10^{5}$km/sec. If sender sends at a rate 1Mbps, then what could be min size of the pcket?(in bits)

srestha asked in Computer Networks Nov 18, 2017

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1 answer

51

CSMA/CD
A 2-km-long, 10-Mbps CSMA/CD LAN (not 802.3) has a propagation speed of 200 m/microsec. Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum, and other overhead. The first ... frame. The effective data rate is _____________________ Mbps (correct to 2 decimal places), excluding overhead, assuming that there are no collisions?

Parshu gate asked in Computer Networks Nov 15, 2017

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3 votes

1 answer

52

CSMA/CD
Two CSMA/CD stations are each trying to transmit long (multiframe) files. After each frame is sent, they contend for the channel, using the binary exponential backoff algorithm. What is the probability that the contention ends on round k? (A) ΣkPk (B) kPk (C) ΣPk (D) none

Parshu gate asked in Computer Networks Nov 13, 2017

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4 votes

1 answer

53

CSMA/CD with and without Collision
A network with CSMA/CD protocol in the MAC layer is running at 1 Gbps over a 1 km cable with no repeaters. The signal speed in the cable is 2 x 108 m/sec. The frame size for this network 10000 bits what is the total time requires to send this frame completely:- 1) when there is no collision in the channel. 2) when there is collision in the channel.

Shubhanshu asked in Computer Networks Nov 12, 2017

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Parshu gate asked in Computer Networks Nov 6, 2017

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1 vote

1 answer

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Parshu gate asked in Computer Networks Nov 6, 2017

382 views

1 vote

2 answers

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Parshu gate asked in Computer Networks Nov 6, 2017

431 views

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Parshu gate asked in Computer Networks Nov 5, 2017

256 views

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akb1115 asked in Computer Networks Oct 30, 2017

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1 vote

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59

CSMA/CD
A simple network consist of two nodes X and Z which are 800 m apart. Each node has a single frame of F = 1500 bits (including all header and preambles) to send to each other. Both nodes attempt to transmit at t = 0'. In case that a node executes the exponential Back-off ... = 1 and Z draws k = 2. The time taken by X's packet (from t = 0) to be completely delivered to Z is ________ μs.

akb1115 asked in Computer Networks Oct 29, 2017

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5 votes

0 answers

60

CSMA/CD
How can i approach this question

junaid ahmad asked in Computer Networks Oct 7, 2017

by junaid ahmad

294 views

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Recent questions tagged csma-cd