Recent questions tagged computer-networks

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1

computer networks general
Which book is good for numerical problems for computer networks for GATE?

asked 14 hours ago in Computer Networks by sushmita Boss (14.6k points) | 21 views

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1 answer

2

self doubt
CRC can detect any odd number of errors. CRC can detect all burst errors of less than the degree of the polynomial. Please explain and if possible give proof

asked 16 hours ago in Computer Networks by Vegeta (349 points) | 10 views

+1 vote

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3

MIT assignment
A geosynchronous satellite has a half-duplex channel with a transmission rate of 10 kbps and a propagation delay of 0.25 sec each way. With a data packet size of 1000 bits and a loss probability p of 0.001 ,(A) what is the expected transmission time of ... parameters are the same as part (a), what is the longest channel propagation delay for which we can still use stop-and-wait?

asked 17 hours ago in Computer Networks by sushmita Boss (14.6k points) | 35 views

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4

Ethernet
Consider two nodes A and B on the same ethernet segment, and suppose the propagation delay between the two nodes is 225 bit times. Suppose at time both nodes A and B begin to transmit a frame. Assume both nodes transmit a 50-bit jam signal after detecting a collision. For 107 bits per set ethernet, the time at which both nodes A and B sense an idle channel is ________ μsec

asked 20 hours ago in Computer Networks by Shivangi Parashar 2 (143 points) | 16 views

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5

https://gateoverflow.in/3838/gate2005-it-75 self doubt

asked 1 day ago in Computer Networks by sushmita Boss (14.6k points) | 16 views

+1 vote

1 answer

6

Ethernet
Nodes A and B are connected by a 100MbPs ethernet segment with 6μ μ s propagation delay between them.Suppose A and B send frames at t=0 and frames get collided.After first collision A draws k=0 and B draws k=1(exponential backoff algorithm ) jam signal is ignored and time out time is one RTT then at what time A's packet gets completely delivered to B? Assume packet size is of 1000bits

asked 3 days ago in Computer Networks by Shivangi Parashar 2 (143 points) | 25 views

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1 answer

7

Tcp AIMD
Consider "Additive -increase multiplicative -decrease "approach of TCP congestion control.one MSS(Maximum Segment Size)is 512B .If the TCP sender doesn't perceive the path as not congested then. What will be the congestion window size after 4RTTS provided the congestion window is assigned 1MSS initially ?

asked 3 days ago in Others by Shivangi Parashar 2 (143 points) | 36 views

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8

Cryptography
Using RSA key crypto system with a = 1, b = 2 etc; value for encryption if prime value are p = 7 and q = 11, the legal value for secret key is . a)69 b)49 c)49 d)119

asked 3 days ago in Computer Networks by Shivangi Parashar 2 (143 points) | 29 views

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9

Question:6 from pearson
Find efficiency of the ring where data rate of link is 4mbps, number of stattionsare 20 separated by 100 meters and bit delay in each station is 2.5 bits.(velocity of propagation =2×10^8m/s) (A)60 bits (B)75bits (C)90bits (D)120bits Someone plz explain this question.....

asked 3 days ago in Computer Networks by Tabassum jahan (13 points) | 5 views

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1 answer

10

Transport layer
For a network which has maximum packet size is 256 bytes . lifetime of a packet is 20 sec and 8 bit sequence number . Find maximum data rate per connection

asked 4 days ago in Computer Networks by Jaggi (81 points) | 39 views

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1 answer

11

Fragmentation
Consider a TCP message that contains 1024 bytes of data and 20 bytes of TCP header is passed to IP for delivery across two networks interconnected by a router (i.e., it travels from the source host to a router to the destination host). The first network has ... the IP layer at the destination for TCP message, in the best case is _________ bytes. (Assume all IP headers are 20 bytes)

asked 4 days ago in Computer Networks by Shivangi Parashar 2 (143 points) | 7 views

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1 answer

12

Tcp AIMD

asked 4 days ago in Computer Networks by Shivangi Parashar 2 (143 points) | 35 views

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13

Doubt
What is the difference between optimal window size and maximum window size in case of GBN protocol?

asked 5 days ago in Computer Networks by Vikas Verma Active (2.6k points) | 20 views

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1 answer

14

Self doubt
RIP and OSPF are which layer protocols ?

asked Oct 8 in Computer Networks by jatin khachane 1 Junior (757 points) | 23 views

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15

how long does it take for a bit to travel from the beginning to the end of the network?

asked Oct 7 in Computer Networks by once_2019 (393 points) | 21 views

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1 answer

16

data link layer
An upper-layer packet is split into 5 frames, each of which has an 90% chance of arriving undamaged. If no error control is done by the data link protocol, how many times must the message be sent on average to get the entire thing through? A. 2.1 B. 1.9 C. 1.7 D. 2.4

asked Oct 7 in Computer Networks by once_2019 (393 points) | 30 views

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1 answer

17

Made Easy Test Series CN
Consider Bob uses an e-mail client (mail reader) such as Outlook to send an e-mail to Alice who uses a Web-based e-mail account (Gmail). The IP address of Alice's mail server is initially unknown to Bob's mail server. Which of the following is the correct sequence of activity for ... by Alice to read this e-mail. a) s1,s2,s3,s4 b) s1,s3,s2,s4 c) s3,s1,s2,s4 a) s3,s2,s1,s4

asked Oct 7 in Computer Networks by Avijit Shaw (33 points) | 18 views

+1 vote

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18

Subnetting
With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts? A. 222 B. 233 C. 241 D.252

asked Oct 6 in Written Exam by Priyam Pandey (39 points) | 26 views

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19

flow control
A series of 1000 bit frames is to be transmitted across a data link 100 km in length at 20 Mbps. If the link has a velocity of propagation 2*10^8 m/s and BER is 2*10 ^-5, then the link utlization for i. selective repeat with send window w=10 ii. go back n with send window w =10 is a) 34%,46% b)46%,20% c)46%,34% d)20%,46%

asked Oct 6 in Computer Networks by balaganesh (125 points) | 8 views

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20

Self doubt
Routing Protocols RIP and OSPF are implemented At APPLICATION LAYER.(Correct me if I am wrong) But the work of routing - Creating table which decides upon optimum paths among available path. It is done at router right ? How this protocols works till Application layer

asked Oct 5 in Computer Networks by jatin khachane 1 Junior (757 points) | 14 views

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21

Testbook Chapterwise test
Which of the following is TRUE 1. A SYN segment can carry data,consumes no sequence number 2. A SYN+ACK segment can't carry data,but does consume one sequence number 3. An ACK segment , if carrying no data doesn't consume a sequence number

asked Oct 5 in Computer Networks by jatin khachane 1 Junior (757 points) | 39 views

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22

Testbook Computer networks
A sender is sending data to the receiver over a half-duplex link.Transmission time for data packets sent from sender to receiver is 80 μs. The propagation delay over the link is 280 μs. What frame size is required for the sliding window protocol with a window size of 8 ... x 106 bits per second. A) 1800 B B) 225 B C) 250 bits D) 2000 bits I am getting answer as 400 B

asked Oct 5 in Computer Networks by jatin khachane 1 Junior (757 points) | 28 views

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1 answer

23

flow control
Host A is sending data to host B over a full duplex link. A and B are using the sliding window protocol for flow control. The send and receive window sizes are 4 packets each. Data packets (sent only from A to B) are all 1500 bytes long and the transmission time ... What is the maximum achievable throughput in this communication? 3.75 10^6 Bps 7.5 10^6 Bps 10 10^6 Bps 12.75 10^6Bps

asked Oct 5 in Computer Networks by balaganesh (125 points) | 15 views

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24

Made Easy test
How to Solve this question ? I am getting answer as 450.

asked Oct 2 in Computer Networks by nephron (479 points) | 58 views

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2 answers

25

Please explain this

asked Oct 1 in Computer Networks by Mayank Joshi (35 points) | 37 views

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26

Doubt
Is throughput same for half duplex and full duplex channel?

asked Sep 30 in Computer Networks by soumayan bandhu Junior (743 points) | 18 views

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27

Self doubt

asked Sep 28 in Computer Networks by jatin khachane 1 Junior (757 points) | 20 views

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28

Computer Network

asked Sep 27 in Computer Networks by Vaishnavi01 (153 points) | 36 views

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1 answer

29

sequence no and window size
If the available sequence number is N then the maximum window size for Selective Repeat and Go Back N and stop and wait protocol are? Please explain in detail for three protocols.

asked Sep 25 in Computer Networks by night_fury (17 points) | 24 views

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30

Doubt
UDP does not insert sequence numbers. The packets are expected to arrive as a continuous stream or they are dropped. What is the meaning of this line?(does it mean UDP discard out of order packets?)

asked Sep 24 in Computer Networks by soumayan bandhu Junior (743 points) | 29 views

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