Recent questions and answers in Computer Networks

0 votes

1 answer

1

computer network
Assume that there are k stations transmitting in an ethernet network using CSMA/CD. Probability that station requires the ethernet in the contention slot with probability P is : A = KP(1-P)^k-1 what is the maximum value of A A) 1/e B) 1/ 2e C) 1/4e D) 0.125e

answered 5 hours ago in Computer Networks by Bikram Veteran (33.3k points) | 19 views

+4 votes

1 answer

2

channel utilization

answered 6 hours ago in Computer Networks by Bikram Veteran (33.3k points) | 82 views

+1 vote

1 answer

3

GBN protocol
Consider the GBN protocol with a sender window size of 4 and a sequence number range of 1,024. Suppose that at time t, the next in-order packet that the receiver is expecting has a sequence number of k. Assume that the medium does not reorder messages. What are all possible ... propagating back to the sender at time t? k-5 → k-1 k-4 → k-1 k-5 → k k-4 → k

answered 19 hours ago in Computer Networks by Abhisek Das (499 points) | 292 views

0 votes

1 answer

4

UPTU question bank
Suppose 4 organization's A,B,C and DATA request 4000,2000,2000 and 8000 host address respectively starting with 198.16.0.0 .Find the 1st IP of each, last IP address assigned and subnet mask of every organization.(Please answer with explanations)

answered 19 hours ago in Computer Networks by Abhisek Das (499 points) | 36 views

+1 vote

3 answers

5

UGCNET-June2012-II-16
In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM? Space division Time division Virtual Packet

answered 20 hours ago in Computer Networks by diamond.17 (39 points) | 349 views

+3 votes

2 answers

6

split horizon
Assume that network shown in below diagram uses distance vector routing with forwarding tables at each node. If each node periodically announces their vectors to the neighbour using the split-horizon strategy, what is the distance vector routing advertised from A to B after stabilization?

answered 22 hours ago in Computer Networks by Nitesh Choudhary Active (1.6k points) | 218 views

0 votes

0 answers

7

Data modems
Please explain PCM and delta modulation technique.....

asked 1 day ago in Computer Networks by alokraj1142 (235 points) | 4 views

0 votes

0 answers

8

Data modems
Please explain ASK,PSK and FSK keying ....

asked 1 day ago in Computer Networks by alokraj1142 (235 points) | 3 views

+6 votes

4 answers

9

GATE2006-46
Station A needs to send a message consisting of 9 packets to Station B using a sliding window (window size 3) and go-back-n error control strategy. All packets are ready and immediately available for transmission. If every 5th packet that A transmits ... lost), then what is the number of packets that A will transmit for sending the message to B? 12 14 16 18

answered 1 day ago in Computer Networks by riki_nitdgp_17 (11 points) | 2.9k views

0 votes

1 answer

10

Gate Practice
A 3000 km long trunk operates at 1.536 Mbps and it is used to transmit 64 Bytes frames. If it uses sliding window protocol then what is the number required sequence numbers. Assume propagation speed of 8 microsec/ km? A. 63 B. 110 C. 123 D. 145 how to solve

answered 2 days ago in Computer Networks by Abhi Girin (35 points) | 17 views

0 votes

1 answer

11

CN practice question
Consider a MAN with server and destination of 20 km apart and one way delay is 2 minutes. At what data rate does RTT equals to transmission delay for 2 KB data? A. 41 bits/ sec B. 68.2 bps C. 69 bps D. 40 bps need solution

answered 2 days ago in Computer Networks by manu00x Loyal (3.2k points) | 15 views

0 votes

1 answer

12

lan techniques.
can anyone tell me how does the formula (min frame)Lmin = 2* tp(propagation delay) *B (bandwidth)came ?

answered 2 days ago in Computer Networks by manu00x Loyal (3.2k points) | 15 views

0 votes

1 answer

13

Pure Aloha and Slotted Aloha
It am not getting the concept of vulnerable time. The frames are of same size so Tx is same and they propagate with same speed. If two objects are moving in the same direction with same constant speed then how can they collide?

answered 2 days ago in Computer Networks by Palash Moon (51 points) | 12 views

0 votes

3 answers

14

Question on hamming code with even parity

answered 2 days ago in Computer Networks by karthik v (11 points) | 444 views

0 votes

1 answer

15

Computer Networks
Bandwidth =100 mbps. Calculate 1 bit delay???

answered 2 days ago in Computer Networks by Gaurav Joshi (383 points) | 26 views

0 votes

1 answer

16

Differential Manchester Encoding . [closed]

answered 3 days ago in Computer Networks by Bikram Veteran (33.3k points) | 44 views

0 votes

1 answer

17

Encoding manchester and differential manchester

answered 3 days ago in Computer Networks by Bikram Veteran (33.3k points) | 488 views

0 votes

2 answers

18

Confusion in Differential Manchester Encoding

answered 3 days ago in Computer Networks by Bikram Veteran (33.3k points) | 38 views

0 votes

1 answer

19

What is relation between bit rate and baud rate ?

answered 3 days ago in Computer Networks by hem chandra joshi Junior (659 points) | 23 views

0 votes

2 answers

20

Name of Data Unit at different layers ?

answered 4 days ago in Computer Networks by Rajesh Pradhan Veteran (17.1k points) | 21 views

0 votes

1 answer

21

cn question
Which of the following addresses is used to deliver a message to the correct application program running on a host? (A) Port (B) IP (C) Logical (D) Physical

answered 4 days ago in Computer Networks by G Shaheena (235 points) | 23 views

0 votes

0 answers

22

Doubt on formula
in csma/cd which formula is right 1 .transmission delay >= 2 * propagation delay 2.transmission delay <= 2 * propagation delay

asked 4 days ago in Computer Networks by hem chandra joshi Junior (659 points) | 18 views

0 votes

0 answers

23

IP addressing
The data link layer provides the host or Mac address. Network layer comes before physical layer at the sender side of OSI reference model. Then how can network layer can do Ip addressing which includes network as well as the host address?

asked 4 days ago in Computer Networks by MiNiPanda (99 points) | 15 views

0 votes

0 answers

24

solve this please
17 * d = 1 mod 3120 please explain how to get d in these questions iam not getting it

asked 4 days ago in Computer Networks by sumit goyal 1 Junior (641 points) | 24 views

+1 vote

3 answers

25

CN: Go Back N
Station A needs to send a message consisting of 15 packets to station B' using a sling window (window size 4) and go-back-N error control strategy. All packets are ready and immediately available for transmission. If every 6th packet that A' transmits gets lost ( ... that A' will transmit for sending the message to B' ? (a) 29 (b) 33 (c) 27 (d) 25

answered 5 days ago in Computer Networks by vamp_vaibhav Junior (567 points) | 437 views

+1 vote

5 answers

26

ISRO-2013-41
What will be the efficiency of a Stop and Wait protocol, if the transmission time for a frame is $20$ns and the propagation time is $30$ns? $20$% $25$% $40$% $66$%

answered 5 days ago in Computer Networks by iqbal137 (21 points) | 1.6k views

+1 vote

3 answers

27

Go back N (arq) protocol
Q. If maximum sequence number in Go back N ( arq) protocol is 'n' then window size (sender) is ? If your answer is 'n' or 'n'+1' then please design GBN for sender window 5 and 11 .

answered 5 days ago in Computer Networks by vamp_vaibhav Junior (567 points) | 47 views

0 votes

1 answer

28

TCP congestion control
Case 1: If congestion window size=100MSS, rwnd=16MSS and RTT=1ms. Then how many time it will take to send full window? case2: If congestion window size=16MSS, rwnd=100MSS and RTT=1ms. Then how many time it ... window? How to decide intial threshold value when there is "congestion" or "no congestion" in the underlying network?

answered 6 days ago in Computer Networks by just_bhavana Active (1.4k points) | 28 views

0 votes

1 answer

29

Can any one explain this question only.

answered 6 days ago in Computer Networks by asriv Junior (677 points) | 27 views

0 votes

1 answer

30

suggestion
Hardware and various devices used in networking .. should i study this topic for gate

answered 6 days ago in Computer Networks by Gaurav Joshi (383 points) | 19 views

0 votes

1 answer

31

Computer Networks Tanenbaum
A noiseless 4-kHz channel is sampled every 1 msec. What is the maximum data rate? How does the maximum data rate change if the channel is noisy, with a signal-to-noise ratio of 30 dB?

answered 6 days ago in Computer Networks by alokraj1142 (235 points) | 17 views

0 votes

0 answers

32

Wireless LAN
A wireless LAN using DSSS with _______-bit chip code needs 320 MHz for sending data that originally required a 20-MHz bandwidth

asked 6 days ago in Computer Networks by Neeraj7375 Junior (567 points) | 8 views

0 votes

0 answers

33

Wireless LAN
A wireless LAN using DSSS with a 4-bit chip code needs 10 MHz for sending data that originally required a _______-MHz bandwidth.

asked 6 days ago in Computer Networks by Neeraj7375 Junior (567 points) | 7 views

0 votes

0 answers

34

Wireless LAN
A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is 10 MHz, the spread spectrum is _______ MHz.

asked 6 days ago in Computer Networks by Neeraj7375 Junior (567 points) | 2 views

0 votes

0 answers

35

Wireless LAN
An FHSS wireless LAN has a spread spectrum of 1 GHz. The bandwidth of the original signal is 250 MHz, and there are ______ hops per cycle

asked 6 days ago in Computer Networks by Neeraj7375 Junior (567 points) | 6 views

0 votes

0 answers

36

Wireless LAN
A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is 10 MHz and 2 GHz is the lowest frequency, the highest frequency of the system is _______ GHz A) 1.0 B) 2.0 C) 2.1 D) 3.0

asked 6 days ago in Computer Networks by Neeraj7375 Junior (567 points) | 4 views

0 votes

1 answer

37

Computer networks
Which of the following system calls not used in UDP echo server program? A) listen() B) socket() C) bind () D)recvfrom()

answered Jul 19 in Computer Networks by pawan kumarln Boss (5.4k points) | 37 views

0 votes

2 answers

38

TCP and UDP checksum
Consider a scenario where UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field. Which of the statement below is true with respect to the above scenario? Receiver ... given is D but I feel it should be B because Tcp checksum is calculated on data and header both.

answered Jul 19 in Computer Networks by vamp_vaibhav Junior (567 points) | 147 views

0 votes

1 answer

39

TCP header
When Checksum is calculated in TCP, why IP header is also included? since it is included why it is only used in computation and not in transmission.

answered Jul 19 in Computer Networks by vamp_vaibhav Junior (567 points) | 35 views

0 votes

1 answer

40

TDM access control method
Let transmission time = 1ms , propagation delay = 1 ms and we have used TDM access control method. What is the efficiency of the network and what is throughput if we are given a bandwidth of 4mbps. If we want to have N number of nodes/stations in this network and each requires 2kbps of bandwidth. Then what is the value of N ?

answered Jul 18 in Computer Networks by sunil_saini (197 points) | 18 views

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