Recent questions tagged computer-networks

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1

Gateforum Test Series
Suppose you are designing a sliding window protocol for a $1Mbps$ point to point link which has one way latency of $1.25s$. Assuming that each frame carries $1kB$ of data, determine the minimum number of bits required for the sequence number. Answer provided - $9$ bits.

asked 8 hours ago in Computer Networks by Gupta731 Active (3k points) | 5 views

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2

Madeeasy[CN-Flow control]
Consider two computers A and B are connected through a network of 30 Mbps.Assume the distance between them is 3000km and the signal propagation speed is same as the speed of light and the packet size is 12 KB. What is minimum number of bits required for window to achieve 100% utilization during GBN and SR protocol ?

asked 13 hours ago in Computer Networks by jatin khachane 1 Active (3.5k points) | 30 views

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3

ME test 2019
for Transmission delay, 2KB, K shall be 1024 and NOT 1000 as its data, right?

asked 1 day ago in Computer Networks by Markzuck (161 points) | 13 views

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4

Madeeasy test doubt 2019
shouldn’t the ans be 5600? as it takes 14 RTTs to get back to full size ans given is considered 15 RTTs please confirm

asked 1 day ago in Computer Networks by Markzuck (161 points) | 24 views

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5

Madeeasy test doubt
shouldn’t the ans be 5600? as it takes 14 RTTs to get back to full size ans given is considered 15 RTTs please confirm

asked 1 day ago in Computer Networks by Markzuck (161 points) | 8 views

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6

gfg quiz
From a large set of prime numbers Jimmy choose 23 and 17 as P and Q respectively and a random integer to be 13. Jimmy wants to sends a plain text to M = 127. What will be the value of cipher text using RSA? since i am getting ciphertext =(127^13) mod 391 now how should i calculate

asked 1 day ago in Computer Networks by vijju532 Junior (721 points) | 21 views

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7

Channel Utilization
Consider a LAN with 500 stations connected to five 500 m segments. The data rate is 10 Mbps and slot time is 51.2 micro sec, If all the stations transmit With equal probability what is the channel utilization using a frame size of 512 bytes? Note-Number of contention slots are 1.716 how to proceed with these kind of questions?

asked 2 days ago in Computer Networks by aditi19 Active (2.2k points) | 18 views

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8

# CN TCP connection establishment doubt about MSS

asked 2 days ago in Computer Networks by iarnav Loyal (9.3k points) | 31 views

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9

Number of subnets can be formed by using the subnet mask 255.255.248.0 in a class B network _________

asked 3 days ago in Computer Networks by rahuljai (401 points) | 58 views

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10

self doubts
Is there any difference in round trip delay when change in transmission medium like double duplex single, single duplex and half duplex with respected to n packets transmitted from A to B.

asked 3 days ago in Computer Networks by Gawade Sahadev (213 points) | 8 views

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1 answer

11

Madeeasy
Assume 2 computers are connected via a network. The network uses GB-7 sliding window protocol for flow control.It is observed that every 5th packet that has been sent is lost. The number of extra packets needs to resend Number of total packets transmitted by sender for sending 10 packets .

asked 3 days ago in Computer Networks by jatin khachane 1 Active (3.5k points) | 50 views

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12

ME CN 1
Consider the following statements: Which of the above statement is correct? A Hidden terminals can be handled by using either of RTS or CTS control frame. B RTS/CTS exchange helps in reducing collisions and leads to efficient use of channel resources. C 802.11 frame has three address fields. D By the help of 802.11 frame, we can come to known whether encryption is used on n

asked 3 days ago in Computer Networks by himgta Active (2.9k points) | 22 views

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13

made easy test series
In the network 143.128.67.235 / 20, it x represent the decimal value of 3rd octet and y represent the decimal value of 4th octet of last IP address assigned to any host, then the value of x*y is

asked 5 days ago in Computer Networks by scarz (51 points) | 17 views

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14

Self Doubt
What is the maximum size of packet which one host can send to other host through application layer?.

asked 5 days ago in Computer Networks by raahul Junior (687 points) | 14 views

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15

IP Header Doubt
https://gateoverflow.in/2062/gate2014-3-28 In the above question we are subtracting the header length from the IP paxket to find out number of IP fragments. But in this question https://gateoverflow.in/8255/gate2015-2-52 Why we are adding the header length to the UDP datagram to find number of IP fragments?

asked 5 days ago in Computer Networks by Shamim Ahmed Active (1.1k points) | 11 views

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1 answer

16

Calculate mod in RSA algorithm
How to calculate Mod of a big number in RSA Like 5 raise to power 13 mod 77

asked Dec 10 in Computer Networks by Fida (85 points) | 55 views

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1 answer

17

COMPUTER NETWORKS ME TEST

asked Dec 8 in Computer Networks by junaid ahmad Loyal (9.2k points) | 44 views

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18

Sequence number In SWP

asked Dec 8 in Computer Networks by junaid ahmad Loyal (9.2k points) | 17 views

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19

GBN Maximum possible data rate

asked Dec 8 in Computer Networks by junaid ahmad Loyal (9.2k points) | 21 views

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1 answer

20

IP Address allocation
An ISP has assigned an address block to user in which 4096 hosts can be assigned IP addresses. Which of the following can be the network ID ? 168.72.90.0/20 168.72.96.0/20 168.72.64.64/20 168.64.64.0/24

asked Dec 8 in Computer Networks by Na462 Loyal (7.5k points) | 36 views

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21

Madeesay Test Series
Consider TCP implements an extension that allows window size much larger than 64KB. Suppose you are using this extended TCP over a 1Gbps link with a latency of 50ms to transfer a 10 MB file and TCP receive window is 1MB. If TCP sends 1KB packet ... multiplied by link latency, then effective throughput of transfer is x Mbps. Find x. (Assuming no congestion and no lost packets)

asked Dec 6 in Computer Networks by Ankit Gupta 5 (59 points) | 36 views

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22

#CN UserGate 2004 IPV4 question
Consider three IP networks A,B and C. Host HA in network A sends messages each containing 180 bytesof application data to a host HC in network C. The TCP layer prefixes 20 byte header to the message. This passes through an intermediate network B. ... ). My question is what's the overhead at Network Layer and also at Transport Layer of the Host C (Destination Host)

asked Dec 5 in Computer Networks by iarnav Loyal (9.3k points) | 32 views

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23

Ace Test Series
Suppose two hosts are connected through two intermediate switches Suppose each link (one way) propagation delay is 20 ms and each link data transfer rate is 1 Mbps. If packet size is 1000 bytes then the amount of time required to send one file of size 5000 Bytes from sender to receiver is______ ms.

asked Dec 4 in Computer Networks by Nidhi Budhraja (203 points) | 55 views

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24

Subnets
Given an IP address 156.233.42.56 with a subnet mask of 7 bits. How many hosts and Subnets are Possible ? 126 hosts and 510 subnet 128 host and 512 subnet 510 hosts and 126 subnet 512 hosts and 128 Subnet

asked Dec 4 in Computer Networks by Na462 Loyal (7.5k points) | 52 views

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25

Subnet addresses
A class B network address 130.50.0.0 is submitted as follows. The last 10 bits of the host id are allotted for host number and the remaining 6 bits are reserved for subnet number. How many subnets and number of hosts in each subnet are possible with above scheme ? 62,1022 30,510 14,254 ... 130.50.4.1 and 130.50.16.1 130.50.1.1 and 130.50.4.1 130.50.0.0 and 130.50.3.0 None of these

asked Dec 4 in Computer Networks by Na462 Loyal (7.5k points) | 46 views

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26

Token ring

asked Dec 3 in Computer Networks by Na462 Loyal (7.5k points) | 39 views

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27

Synchronous data transfer

asked Dec 3 in Computer Networks by Na462 Loyal (7.5k points) | 37 views

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28

Gateforum Test Series
IP address: 192.168.0.1 Subnet mask: 255.255.255.240 What is the address of 5th host of 6th subnet? 192.168.0.100 192.168.0.85 192.168.0.84 192.168.0.101 My answer is D but B is provided as answer.

asked Dec 3 in Computer Networks by Gupta731 Active (3k points) | 45 views

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29

Significance of pseudoheader .
Please explain how can source and destination IP address be invlincl in a TCP Segment when IP address are to be dealt at network layer . Why do we have a different checksum in TCP Segment when we already have a one in IP header .

asked Dec 3 in Computer Networks by radha gogia Loyal (7.9k points) | 31 views

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30

token ring
Determine the efficiency of a token ring with a data rate of 250Mbps, a ring latency of 120 µsec and 5000 bit packets. Assume M hosts want to transmit and each host holds the token for a maximum of frame transmission time.

asked Dec 2 in Computer Networks by Yazanotoom50 (13 points) | 31 views

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