Recent questions tagged computer-networks

0 votes

1 answer

1

Computer Networks-Sliding Window
The round trip delay between X and Y is given as 60ms and the bottle nexk bandwidth of link between X and Y is 512 KBps. What is the optimal window size if the packet size is 64 bytes and the channel is full duplex. My answer is coming to be 481. is it correct?

asked 1 day ago in Computer Networks by Ayush Upadhyaya Boss (11.1k points) | 49 views

0 votes

3 answers

2

test series
DH key exchange algorithm is used to establish a session between sender and receiver with n=23 and g=5. The sender's secret key is 6 and the receiver's secret key is 15. What is the secret key between the receiver and sender? Please explain with solution P.S: Answer is given as 2

asked 2 days ago in Computer Networks by Kalpataru Bose (367 points) | 45 views

+2 votes

0 answers

3

Sliding window
Consider a sliding window protocol operating at the data link layer between two stations 1000 kilometers apart, directly connected by an error-free 1.0 Mbps link. The frame sizes used are 500 bits, of which 50 bits are header and 450 bits are data. Ack frames are 100 ... signal propagation delay is 10 µsec/km. If a window size of W = 10 is used, then the efficiency of the channel is

asked 3 days ago in Computer Networks by Jaggi (59 points) | 29 views

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0 answers

4

Computer network
we know that router is a 3 layer device (upto network layer)....then how it runs RIP,OSPF protocol for routing protocol ????i mean routing protocol runs on transport layer(because they uses UDP/TCP).....how it is possible??

asked 6 days ago in Computer Networks by Ravi prakash pandey Junior (753 points) | 10 views

+1 vote

0 answers

5

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 $50 \mu s$ ?

asked 6 days ago in Computer Networks by Ayush Upadhyaya Boss (11.1k points) | 22 views

0 votes

0 answers

6

GATE syllabus
Does TDM, pooling, Token Ring access control method in GATE 2019 Syllabus?

asked Aug 12 in Computer Networks by abdulmcajh (7 points) | 13 views

0 votes

1 answer

7

Doubt in networking
Except reliability and connection oriented what are the other functionalities which are produced by TCP but not by UDP?

asked Aug 10 in Computer Networks by soumayan bandhu (429 points) | 18 views

0 votes

1 answer

8

Doubt in networking
What is the difference between host to host network connection and end to end network connection? Why host to host connection for network layer and end to end connection for transport layer?

asked Aug 10 in Computer Networks by soumayan bandhu (429 points) | 22 views

0 votes

0 answers

9

Doubt in networking
I have a small doubt about throughput concept in TDM. Can you explain how Throughput of LAN = number of stations in LAN * Throughput of each station. (Throughput is in bits per second )

asked Aug 10 in Computer Networks by soumayan bandhu (429 points) | 6 views

0 votes

1 answer

10

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)?

asked Aug 7 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 32 views

0 votes

1 answer

11

Made Easy Workbook - Computer Networks
If two stations A and B uses copper twisted pair cable having capacity 200 bits/sec. if A transmitted 20 frames to B each of size 50 bits, Assume RTT is neglected. What is the time (in Sec) required to transmit the single frame from A to B if pipelining has been used?

asked Aug 6 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 25 views

0 votes

1 answer

12

Made Easy Workbook - Computer Network
In a Hub based lan system collision is detected by a) Hub b) Transmitting node c) Hub and Transmitting Node d) Recieving Node

asked Aug 6 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 14 views

0 votes

0 answers

13

Made Easy Workbook
What signal-to-noise ratio is needed to put a T1 carrier on a 50-kHz line?

asked Aug 6 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 14 views

+1 vote

0 answers

14

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.

asked Aug 5 in Computer Networks by irfan119 (17 points) | 13 views

0 votes

0 answers

15

#KUROSE computer network
While reading Kurose book of Computer Network, application layer, about throughput i came across a sentence "There’s an adage that says that one cannot be too rich, too thin, or have too much throughput!" Could anybody please suggest what exactly it means and why can't we have /what is the disadvantage of very high throughput?

asked Aug 4 in Computer Networks by akshat sinha (327 points) | 13 views

0 votes

2 answers

16

Slidind window protocol
Station A needs to send a message consisting of 10 packets to station B using a sliding window of size 4. All packets are ready and can be transferred immediately.Selective repeat and GBN are used at 2 different times and every 5th packet get lost for ... of transmissions that A has to make in selective repeat and GBN respectively to ensure safe delivery to B. Then x+y= ?

asked Aug 2 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 50 views

+1 vote

1 answer

17

Data Link Layer
What is the channel capacity of printer (in bps) with a 400Hz bandwidth and a signal to noise ratio is 7 dB?

asked Aug 2 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 13 views

0 votes

2 answers

18

Data Link Layer
The distance b/w two microwave towers, with the link capacity 100 Mbps, is 24 km and the speed of the signal is 3 x 10^8 m/sec. If the frame size is 16 Kb in the stop-and-wait protocol, what is the approximate link utilization? Assume that the ACK packets are negligible in the size and there are no errors during communication. a. 33% b. 50% c. 66% d. 75%

asked Aug 2 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 24 views

0 votes

0 answers

19

Supernetting
I have doubt that how to merge the ip addresses into single one using Aggregation. Please discuss the approach Like I have ip addresses 192.24.0.0/21,192.24.16.0/20,192.24.8.0/22 It's merged into single one ip 192.24.0.0/19 How, I am little confused with the approach help me out here :)

asked Aug 1 in Computer Networks by Na462 Active (4.6k points) | 26 views

0 votes

1 answer

20

Data Link Layer
The IEEE 802 project provides the data link layer into two sublayers. Which sublayer of the data link layer communicates directly with the NIC? a) Logical Link Control Sublayer b) Logical Access Control Sublayer c) Medium Access Control Sublayer d) Data Access Control Sublayer

asked Jul 31 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 23 views

0 votes

0 answers

21

IP Addressing
An IP router implementing CIDR services a packet with address 131.23.151.76. The routers routing table has the following entries: Prefix Output Interface Identifier 131.16.0.0/12 3 131.28.0.0/14 5 131.19.0.0/16 2 131.22.0.0/15 1 The identifier of the output interface on which this packet will be forwarded is______________

asked Jul 30 in Computer Networks by Sumit Singh Chauhan Junior (943 points) | 20 views

0 votes

0 answers

22

Networks - Access Control
Consider the following statements: S1 : Token bucket shapes bursty traffic into fixed-rate traffic by averaging the data rate. S2 : Leaky buckets are more restrictive compared to token bucket. S3 : A choke packet is a congestion-control mechanism in which a packet is sent ... of congestion. Which of the given statements are false? a. S1 b. S2 c. S1 & S2 d. all of these

asked Jul 27 in Computer Networks by Concerned Geek (21 points) | 16 views

0 votes

1 answer

23

packet switching
Consider the store and forward packet switched network where host A and B are connected via 2 routers R1 and R2 . Assume Transmission time to be 1ms and Propagation time of link to be 5ms. If a message is divided into 6 packets of equal length then total time to transfer message is _________ ?

asked Jul 26 in Computer Networks by Lone Wolf Junior (875 points) | 70 views

0 votes

0 answers

24

Syllabus Doubt
What exactly to study in IEEE 802.11 Wireless medium for GATE 2019 Following Topics are there in tanenbaum which is the book i am refering. 1.IEEE 802.11 Architecture and Protocol stack 2. The 802.11 Physical layer 3. The 802.11 MAC Sublayer Protocol 4. The ... vary vast i dont know exactly what to study in GATE 2018 syllabus its wriiten only Basics of Wifi. Help me out here Please.

asked Jul 24 in Computer Networks by Na462 Active (4.6k points) | 26 views

0 votes

1 answer

25

Data Link Layer
In Go Back N ARQ Protocol, why is the sender window size < 2^m and not less than 3^m or some other number?

asked Jul 22 in Computer Networks by manav1032 (23 points) | 18 views

0 votes

0 answers

26

Question on Datagram
Data are transmitted over the Internet in datagrams, which are structured blocks of bits. Each datagram contains header information organized into a maximum of 14 different fields (specifying many things, including the source and destination addresses) and a data area ... data area can be transmitted if the header length is 20 octets and the total length is as long as possible?

asked Jul 14 in Computer Networks by Balaji Jegan Active (1.4k points) | 25 views

0 votes

2 answers

27

POP3 vs IMAP
What are some key differences between POP3 and IMAP?

asked Jul 13 in Computer Networks by Mk Utkarsh Boss (14.1k points) | 36 views

0 votes

0 answers

28

Physical layer
To transmit 100 digitized voice channel using a channel of 20 KHz. what should be the ratio of bits/hertz if we use no guard band. assume the human voice normally contains frequencies from 0 to 4000 hz and assume 8 bits per sample.

asked Jul 10 in Computer Networks by Jaggi (59 points) | 23 views

0 votes

0 answers

29

Transport Layer-Self doubt
Here A,B,C are 3 networks and a packet sends from A to C . When packet 180 B sends from A to B it is connected with 20B IP header as well as 20 B TCP header. In network B we are segmenting data packet as 100 B and we are removing IP header ... destination C. My question is if IP header are different for network A, B,C then how TCP header will be same for network A,B,C?

asked Jul 10 in Computer Networks by srestha Veteran (92.2k points) | 32 views

0 votes

0 answers

30

Syllabus Doubt
Is Guided and Unguided mode of transmission from physical layer really asked in exam?

asked Jul 9 in Computer Networks by Na462 Active (4.6k points) | 30 views

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