Recent questions and answers in Computer Networks

0 votes

1 answer

1

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.

answered 6 hours ago in Computer Networks by Priyanka Agarwal Active (1.7k points) | 6 views

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0 answers

2

#Routing
Consider a network with hierarchical routing with 5760 routers, r region and c cluster sizes should be chosen to minimize the size of the routing table for a three-layer hierarchy. What is the minimum size of table? 1. 21 2. 36 3. 27 4. 37

asked 15 hours ago in Computer Networks by Aarvi Chawla (43 points) | 5 views

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3

self doubt
if full duplex link is given then do we need to multiply by 2 to find the throughput or throughput remain the same throughput =efficiency*bandwidth now for full duplex links does this formula change or not???

asked 16 hours ago in Computer Networks by garimanand (205 points) | 5 views

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0 answers

4

Read/Unread questions
@Arjun sir, How can I access the read questions? Will I have to bookmark them all? At the time of revision it helps a lot to go through the read questions. Please help. Can u provide an extension for that pupose? [closed]

asked 17 hours ago in Computer Networks by nephron (407 points) | 9 views

0 votes

1 answer

5

Routers
A router outside the organization received a packet 224.240.7.91. Consider following steps taken by router. 1. The router looks in its routing table to find out how to route the packet to the destination. 2. The router looks at the first byte of the address to find the class. 3. The default mask ... required step for finding the route? (A) 3 - 1 (B) Only 1 (C) 2 - 3 - 1 (D) 1 - 2 - 3

answered 19 hours ago in Computer Networks by __A12 (55 points) | 8 views

0 votes

1 answer

6

Additive increase Multiplicative Decrease

answered 1 day ago in Computer Networks by nephron (407 points) | 42 views

+1 vote

1 answer

7

Computer Networks
In TCP checksum is mandatory but in UDP checksum is optional. Why ?

answered 1 day ago in Computer Networks by nephron (407 points) | 144 views

0 votes

1 answer

8

Doubt
Consider a LAN with 500 stations connected to five 500 m segments. The data rate is 10 Mbps and the 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 (Number of contention slots are 1.716) (A) 18% (B) 90% (C)None (D) 82%

answered 1 day ago in Computer Networks by Shubhgupta Active (3.3k points) | 9 views

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1 answer

9

IPv4 (Wrap around time)
Consider an IPv4 network. Each host can generate packets at the rate of 500 packets per second. If each host in the network is identified by unique identification number of 48 bits, then the host wrap around time for generating packets will be ________s

answered 1 day ago in Computer Networks by Peach (209 points) | 11 views

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1 answer

10

TCP-congestion control
Assume a scenario where the size of congestion window of a TCP connection be 40 KB when a timeout occurs. The maximum segment size (MSS) be 2 KB. Let the propagation delay be 200 msec. The time taken by the TCP connection to get back to 40 ... is 6000msec.I am taking MSS as 2KB.ls someone explain NOTE:same question also asked here https://gateoverflow.in/1794/gate2014-1-27

answered 1 day ago in Computer Networks by Maddy bhatt (11 points) | 282 views

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0 answers

11

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 1 day ago in Computer Networks by soumayan bandhu Junior (645 points) | 13 views

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0 answers

12

computer network(TDM)
what will be answer for Q.80

asked 2 days ago in Computer Networks by BASANT KUMAR Active (1.6k points) | 7 views

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1 answer

13

Computer Network Subnet
A class-C address has the following subnet mask $255.255.255.192$. Which of the following are valid IP addresses under this network? i. $194.25.64.68$ ii. $194.43.75.128$ iii. $194.65.73.64$ iv. $194.75.74.131$ (A) i & ii (B) i, ii and iv (C) i, & iv (D) ii & iv

answered 2 days ago in Computer Networks by BASANT KUMAR Active (1.6k points) | 7 views

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14

CSMA/CD
Consider a scenario of CSMA / CD network. Suppose adapter A and B attempt to transmit a frame simultaneously and collide, with exponential back off algorithm. A choose k =0 and B also choose k=0._Again they collide; after this collision both A and B will choose k with equal probability from set A (A) for A ... ,2;3} &for B, {0,1,2,3} (C) for A, {0,1} & for B, {0,1} (D) None of these

asked 2 days ago in Computer Networks by BOB (109 points) | 8 views

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0 answers

15

Doubt
In a Gb Ethernet a particular node has issued a ‘ PAUSE ‘ frame to other end directing to pause for 1000 units of time . what is the total wait time ? (A)128-microsecond (B)64-microsecond (C)512-microsecond (D)32-microsecond

asked 2 days ago in Computer Networks by BOB (109 points) | 3 views

0 votes

0 answers

16

Doubt
In TCP, what is the minimum number of packets required to complete the data transfer between sender and receiver? (A) 9 (B) 8 (C) 7 (D) 6

asked 2 days ago in Computer Networks by BOB (109 points) | 10 views

0 votes

0 answers

17

Doubt
The round trip delay between X and Y is given as 60 ms and bottle neck bandwidth of link between X and Y is 512 KBps. What is _____ the optimal window size (in packets) if the packet size is 64 bytes and channel is full duplex.

asked 2 days ago in Computer Networks by BOB (109 points) | 6 views

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0 answers

18

Computer Networks Sub Netwoks
Consider an organization with a class-C IP network address of 195.37.5.0, they wish to divide the network into different sub networks. The subnet mask is 255.255.255.192 Q.1. Which one of the following is not a broadcast address in any of the sub ... IP address belongs to (A) The first sub network (B) The second sub network (C) third sub network (D) Fourth sub network

asked 2 days ago in Computer Networks by BOB (109 points) | 3 views

0 votes

0 answers

19

Computer Network Firewall
Which of the following parameters can be used by a firewall to decide whether to forward/drop packets? (a) Sources IP address and destination IP address (b) TCP/UDP sources and destination port numbers (c) TCP/SYN and ACK bits (d) All of these

asked 2 days ago in Computer Networks by BOB (109 points) | 3 views

0 votes

0 answers

20

Computer Network Public Key

asked 2 days ago in Computer Networks by BOB (109 points) | 7 views

0 votes

0 answers

21

Doubt
"The services required in a public key cryptosystem is Authentication", then which of the following is correct? (a) Sender encrypts the data using receiver's public key (b) Sender encrypts the data using its public key (c) Sender encrypts the data using its private key (d) None of these

asked 2 days ago in Computer Networks by BOB (109 points) | 3 views

0 votes

0 answers

22

Made Easy test series
Consider Shubhani wants to transfer a file from host A to host B connected via a link with 100 Mbps bandwidth. Shubhani chooses maximum file size to transfer with MSS of 1460 B. If total 66 bytes of transport, network and data link layer header are added to each segment before the packet is sent over the link, then the time to transmit the file is _____s.

asked 2 days ago in Computer Networks by Sambhrant Maurya Junior (673 points) | 17 views

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0 answers

23

TCP 3-way-handshake

asked 2 days ago in Computer Networks by Sambhrant Maurya Junior (673 points) | 7 views

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0 answers

24

Flooding
[closed]

asked 2 days ago in Computer Networks by Sambhrant Maurya Junior (673 points) | 5 views

0 votes

2 answers

25

computer networks
A problem with __________ is that capacity is wasted because the medium will generally remain idle following the end of a transmission, even if there are one or more stations waiting to transmit. (A) 1-persistent CSMA (B) slotted ALOHA (C) p-persistent CSMA (D) nonpersistent CSMA

answered 2 days ago in Computer Networks by Priyanshu Debnath (27 points) | 11 views

0 votes

1 answer

26

Self doubt
In CSMA CD: 1) Before starting transmission of frame station sense COMPLETE carrier or only its connection point ? example : if D is transmitting frame to E WIll A sense carrier as idle or busy 2) Lets take At time t = 5 Station A wants to send ... to send frame to E . WIll it be possible simultaneously ? Does detecting channel idle by two stations ALWAYS imply collision will happen ?

answered 2 days ago in Computer Networks by Priyanshu Debnath (27 points) | 8 views

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0 answers

27

Selective Repeat ARQ
If the sender window size is 128 using selective repeat ARQ, then the sequence number of the frame to be sent after sending 400 frames is __________ [closed]

asked 2 days ago in Computer Networks by Sambhrant Maurya Junior (673 points) | 18 views

0 votes

1 answer

28

Computer Subnet

answered 2 days ago in Computer Networks by Priyanshu Debnath (27 points) | 56 views

0 votes

0 answers

29

error correction
can we correct error if minimum hamming distance is even ? example if minimum hamming distance is 6 than how much bit error we can correct?

asked 2 days ago in Computer Networks by Ashish01 (11 points) | 7 views

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0 answers

30

Transport layer
What does this line means? UDP is no-frills extension of "best effort" IP

asked 4 days ago in Computer Networks by nephron (407 points) | 14 views

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0 answers

31

sample question
If TCP round trip time is currently 20 ms and ACK comes in after 30 ms then what is the timeout period for next transmission . Use α=0.9 and β=2 I know that α is smoothening factor. what is meant by β?

asked 4 days ago in Computer Networks by vk_9_1_9 (33 points) | 12 views

0 votes

1 answer

32

TCP Protocol

answered 4 days ago in Computer Networks by garimanand (205 points) | 33 views

0 votes

1 answer

33

GATE-2018-14
Consider the following statements regarding the slow start phase of the TCP congestion control algorithm. Note that cwnd stands for the TCP congestion window and MSS window denotes the Maximum Segments Size: The cwnd increases by 2 MSS on every successful acknowledgment The cwnd ... i and iv are true The answer is given as c. But i want to know why statement (ii) is false

answered 4 days ago in Computer Networks by Deepak Chauhan 1 (27 points) | 16 views

0 votes

1 answer

34

mock test
what is the approach for this question

answered 4 days ago in Computer Networks by Navneet Kalra (425 points) | 15 views

0 votes

0 answers

35

Computer Network
In IPV6 what are the Headers i need to learn. And do i have to remember the fields present in Unicast, Multicast, Geography unicast addess?

asked 5 days ago in Computer Networks by abhishek1995_cse (37 points) | 12 views

0 votes

0 answers

36

TCP packet acknowledgement
Does the sender will get acknowledgement for the packet that he sent to receiver after the receiver processes the packet or right after packet gets stored in receiver window?

asked 5 days ago in Computer Networks by sathvikchiramana (201 points) | 24 views

0 votes

0 answers

37

Routing table size

asked 5 days ago in Computer Networks by Na462 Loyal (5.7k points) | 14 views

0 votes

0 answers

38

DES Algorithm

asked 5 days ago in Computer Networks by Na462 Loyal (5.7k points) | 19 views

+15 votes

5 answers

39

GATE2008-58
A computer on a $10$ $Mbps$ network is regulated by a token bucket. The token bucket is filled at a rate of $2$ $Mbps$. It is initially filled to capacity with $16$ $Megabits$. What is the maximum duration for which the computer can transmit at the full $10$ $Mbps$? $1.6$ seconds $2$ seconds $5$ seconds $8$ seconds

answered 5 days ago in Computer Networks by Himanshu Kumar 1 (227 points) | 3.8k views

0 votes

0 answers

40

Wraparound time
Will wraparound time of sequence number in tcp header depends on the size of the packet?

asked 5 days ago in Computer Networks by sathvikchiramana (201 points) | 11 views

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