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Recent questions tagged lan-technologies

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Andrew S. Tanenbaum Edition 5th Exercise 4 Question 25 (Page No. 352)
Suppose that an 11-Mbps 802.11b LAN is transmitting 64-byte frames back-to-back over a radio channel with a bit error rate of 10−7. How many frames per second will be damaged on average?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5th Exercise 4 Question 20 (Page No. 352)
How many frames per second can gigabit Ethernet handle? Think carefully and take into account all the relevant cases. Hint: the fact that it is gigabit Ethernet matters.

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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2 votes

1 answer

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Andrew S. Tanenbaum Edition 5th Exercise 4 Question 19 (Page No. 352)
Some books quote the maximum size of an Ethernet frame as 1522 bytes instead of 1500 bytes. Are they wrong? Explain your answer.

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5th Exercise 4 Question 18 (Page No. 352)
Ethernet frames must be at least 64 bytes long to ensure that the transmitter is still going in the event of a collision at the far end of the cable. Fast Ethernet has the same 64-byte minimum frame size but can get the bits out ten times faster. How is it possible to maintain the same minimum frame size?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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5

Andrew S. Tanenbaum Edition 5 Exercise 4 Question 10 (Page No. 351)
Consider five wireless stations, A, B, C, D, and E. Station A can communicate with all other stations. B can communicate with A, C and E. C can communicate with A, B and D. D can communicate with A, C and ... is sending to A, what other communications are possible? (c) When B is sending to C, what other communications are possible?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5 Exercise 4 Question 7 (Page No. 351)
How long does a station, s, have to wait in the worst case before it can start transmitting its frame over a LAN that uses the basic bit-map protocol?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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7

Andrew S. Tanenbaum Edition 5 Exercise 4 Question 6 (Page No. 351)
What is the length of a contention slot in CSMA/CD for (a) a 2-km twin-lead cable (signal propagation speed is 82% of the signal propagation speed in vacuum)?, and (b) a 40-km multimode fiber optic cable (signal propagation speed is 65% of the signal propagation speed in vacuum)?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5 Exercise 4 Question 5 (Page No. 351)
In an infinite-population slotted ALOHA system, the mean number of slots a station waits between a collision and a retransmission is 4. Plot the delay versus throughput curve for this system.

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5 Exercise 4 Question 4 (Page No. 351)
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) ... of exactly k collisions and then a success? (c) What is the expected number of transmission attempts needed?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

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3 votes

1 answer

10

Andrew S. Tanenbaum Edition 5 Exercise 4 Question 2 (Page No. 351)
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?

ajaysoni1924 asked in Computer Networks Mar 15, 2019

by ajaysoni1924

15.4k views

26 votes

6 answers

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GATE CSE 2019 | Question: 49
Consider that $15$ machines need to be connected in a LAN using $8$-port Ethernet switches. Assume that these switches do not have any separate uplink ports. The minimum number of switches needed is ______

Arjun asked in Computer Networks Feb 7, 2019

by Arjun

19.8k views

1 vote

1 answer

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Gateforum Test Series: Computer Networks - Lan Technologies
Consider a scnario of CSMA/CD network. Suppose A & B attempt to transmit a frame simultaneously and collide. Using exponential backoff algorithm A chooses K=0 and B chooses K=1. Again they collide and after the 2nd collision both A & B will choose K with equal ... {0,1} and for B {0,1,2,3} For A {0,1,2,3} and for B {0,1,2,3}

Gupta731 asked in Computer Networks Jan 13, 2019

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MadeEasy Test Series: Computer Networks - Lan Technologies
If probability of frame reaching safely is 0.1 then mean number of transmissions of a frame to make it success is _____. what is wrong with the approach given below random variable x is the number of transmission' X 1 2 3 4 so on P(X ... which comes out to be 100. but given the answer is 10 using 1/p. (what is wrong in above aproach?)

newdreamz a1-z0 asked in Computer Networks Dec 31, 2018

by newdreamz a1-z0

544 views

1 vote

0 answers

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Gateforum Test Series: Computer Networks - Lan Technologies
As per the explanation here https://gateoverflow.in/1983/gate2014-2-25#7752 the answer should be 21. But 17 is provided as answer.

Gupta731 asked in Computer Networks Nov 28, 2018

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2 answers

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Gateforum Test Series: Computer Networks - Lan Technologies
Let cluster of stations share 48kbps of pure aloha channel. Every station outputs frame of length 1024 bit in every 50 seconds. Then what is the maximum value of number of stations?

Parth Shah asked in Computer Networks Nov 5, 2018

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Na462 asked in Computer Networks Sep 15, 2018

by Na462

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17

MadeEasy Test Series: Computer Networks - Lan Technologies
The minimum frame length (in bytes) of the cable of length 240 meter for transmitting data at a rate of 500 Kbps in IEEE 802.3 LAN is __________. (Assume the signal speed in the cable to be, 2,00,000 m/s)

_jerry asked in Computer Networks Feb 1, 2018

by _jerry

699 views

4 votes

2 answers

18

MadeEasy Test Series 2018: Computer Networks - Lan Technologies
Here i'm not able to get after how much time X and Y will face first collision

charul asked in Computer Networks Jan 9, 2018

by charul

950 views

4 votes

0 answers

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Pawan Kumar 2 asked in Computer Networks Nov 20, 2017

by Pawan Kumar 2

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5 votes

3 answers

20

Ethernet
Consider two nodes A and B on the same Ethernet, and suppose the propagation delay b/w the two nodes is 225-bit times. Suppose at the time both nodes A and B begin to transmit a frame.Both nodes transmit a 50-bit jam signal after detecting collision. For 10^7 bit/set find the time at which both nodes A and B sense idle channel?

saxena0612 asked in Computer Networks Aug 26, 2017

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1 vote

1 answer

21

Test by Bikram | Mock GATE | Test 4 | Question: 27
Which among the following statements is NOT correct ? Packets sent on Ethernets are limited in size. Networks connected by Ethernets are limited in length to a few hundred meters. Ethernets use buses with multiple masters. Ethernets use circuit switching to send messages.

Bikram asked in Computer Networks May 14, 2017

by Bikram

360 views

1 vote

1 answer

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Test by Bikram | Mock GATE | Test 3 | Question: 28
Two $CSMA/CD$ stations are each trying to transmit large files of multiple frames. After each frame is sent, they contend for the channel using the binary exponential back-off algorithm. The probability that the contention ends in round $3$ is _____ (up to 3 decimal points).

Bikram asked in GATE Feb 9, 2017

by Bikram

750 views

1 vote

5 answers

23

UGC NET CSE | January 2017 | Part 3 | Question: 25
Suppose there are N stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is____ $nP(1-P)^{n-1}$ $nP$ $P(1-P)^{n-1}$ $n^P (1-P)^{n-1}$

go_editor asked in Computer Networks Jan 31, 2017

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1 vote

1 answer

24

Local Area Network

Rahul Jain25 asked in Computer Networks Jan 25, 2017

by Rahul Jain25

1.1k views

3 votes

2 answers

25

Ethernet
What is the maximum theoretical percent utilization in a 802.3 LAN (that uses 10 base 5 cable) with 128 stations connected to five 500 meter segments. The data rate is 10 Mbps. Assume the frame size is 256 bytes and standard slot time is 51.2 μsec. (A) 70% (B) 90% (C) 80% (D) 60%

Sanket_ asked in Computer Networks Dec 25, 2016

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1 vote

2 answers

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UGC NET CSE | December 2010 | Part 2 | Question: 27
The baud rate is Always equal to the bit transfer rate Equal to twice the bandwidth of an ideal channel Not equal to the signalling rate Equal to half of the bandwidth of an ideal channel

makhdoom ghaya asked in Computer Networks Sep 8, 2016

by makhdoom ghaya

2.9k views

4 votes

2 answers

27

what is the throughput of channel
A broadcast channel has 10 nodes and total capacity of 10 Mbps. It uses polling for medium access. Once a node finishes transmission, there is a polling delay of 80 μs to poll the next node. Whenever a node is polled, it is allowed to ... The maximum throughput of the broadcast channel is A) 1 Mbps B) 100/11 Mbps C) 10 Mbps D) 100 Mbps please explain

indrajeet asked in Computer Networks Jun 12, 2016

3.1k views

7 votes

2 answers

28

ISRO2008-4
On a LAN ,where are IP datagrams transported? In the LAN header In the application field In the information field of the LAN frame After the TCP header

ajit asked in Computer Networks Sep 20, 2015

by ajit

5.1k views

31 votes

6 answers

29

GATE IT 2005 | Question: 28
Which of the following statements is FALSE regarding a bridge? Bridge is a layer $2$ device Bridge reduces collision domain Bridge is used to connect two or more LAN segments Bridge reduces broadcast domain

Ishrat Jahan asked in Computer Networks Nov 3, 2014

by Ishrat Jahan

11.3k views

5 votes

4 answers

30

GATE IT 2004 | Question: 82
Consider a 10 Mbps token ring LAN with a ring latency of 400 µs. A host that needs to transmit seizes the token. Then it sends a frame of 1000 bytes, removes the frame after it has circulated all around the ring, and finally releases the token. ... every frame. Assuming that only a single host wishes to transmit, the effective data rate is 1 Mbps 2 Mbps 5 Mbps 6 Mbps

Ishrat Jahan asked in Computer Networks Nov 2, 2014

by Ishrat Jahan

7.2k views

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