Recent questions and answers in Computer Networks

Recent questions and answers in Computer Networks

0 votes

2 answers

1

Self doubt CN
Can the header length of IPV4 change at the router? If yes, then why?

tusharhigh answered in Computer Networks 17 hours ago

41 views

0 votes

1 answer

2

Applied Full length Test
The packet is sent from source to router with the link having the maximum transmission unit (MTU) as 480 bytes, the header is of size 20 bytes. The intermediate fragment size is X and the last fragment size is Y when the packet size is of 2000 bytes including the header. Calculate the value of X+Y in bytes? what i was getting 672 but they have given 652

Kabir5454 answered in Computer Networks 18 hours ago

23 views

1 vote

3 answers

3

MADE EASY TEST SERIES | MOCK 2 - 2022
Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in PERSISTENT mode. The web page contains text ... very small images. The minimum number of TCP connections required to display the web page completely in your browser is ___.

Ogneev answered in Computer Networks 19 hours ago

by Ogneev

56 views

0 votes

1 answer

4

computer networks - queuing delay
Consider the queuing delay in a router buffer (preceding an outbound link). Suppose packet length is L bits and the link rate is R bps, and that N packets arrive to the buffer every LN/R seconds. Find the average queuing delay of the packets.

Kabir5454 answered in Computer Networks 23 hours ago

31 views

0 votes

1 answer

5

#Made easy
Let N stations share 40kbps of pure aloha channel. Frame size is 512 bits which are send at every 40 seconds. The maximum value of N is ____

Chandrabhan Vishwa 1 answered in Computer Networks 2 days ago

by Chandrabhan Vishwa 1

109 views

0 votes

1 answer

6

Made Easy Test Series
The round trip delay between A and B is given as 60 ms, and the bottleneck bandwidth of the link between A and B is 512 KBps. What is the optimal window size (in packets) if the packet size is 64 bytes and the channel is full duplex.

aaa 1 answered in Computer Networks 2 days ago

by aaa 1

45 views

40 votes

9 answers

7

GATE CSE 2015 Set 1 | Question: 29
Consider a LAN with four nodes $S_1, S_2, S_3,$ and $S_4$. Time is divided into fixed-size slots, and a node can begin its transmission only at the beginning of a slot. A collision is said to have occurred if more than ... respectively. The probability of sending a frame in the first slot without any collision by any of these four stations is__________________.

ProtonicRED answered in Computer Networks 5 days ago

8.4k views

0 votes

1 answer

8

made easy mock 1 2022
persistent connection require all info at one time while non persistent require every time a new connection can any one solve this question..

Isha_99 answered in Computer Networks 6 days ago

93 views

0 votes

1 answer

9

GeeksForGeeks AIM 2 - computer networks
Consider a message with 60000 bits long, that is to be sent from a source to a destination, there are two routers between source to destination. Each of link in the path has bandwidth 1 Mbps, each packet is 1000 bit long, total time taken (in msec) to reach the last bit to the destination, propagation delay is 10 msec ________.

ramakrushna answered in Computer Networks Jan 15

57 views

0 votes

0 answers

10

Self made doubt
suppose we are given the congestion window 30KB and TO occurs than new th=15 and mss given =2 so when we start with slow start than sequence goes like:- 2 → 4 → 8 → 15 → 17 and so on or 2 → 4 → 8 → 14 → 16 → 18 and so on?

Sagar475 asked in Computer Networks Jan 15

24 views

0 votes

2 answers

11

Subnetting
Consider a router that interconnects three subnets: Subnet 1, Subnet 2 and Subnet 3. Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. Also, subnet-1 is required to support upto 125 interfaces and subnet-2 and 3 are each required to support upto 60 interfaces Write a feasible set of subnet address / subnet mask pairs?

manishi answered in Computer Networks Jan 12

1.9k views

1 vote

1 answer

12

Pure Aloha | Made Easy Full Syllabus Test
A group of N stations shares a 100 Kbps pure ALOHA channel. Each station outputs a 1000 byte frame on average once every 50 seconds. The maximum value of N is ________. This is the solution they have provided, and i cannot make any sense out of it.

Yaman Sahu answered in Computer Networks Jan 11

105 views

0 votes

1 answer

13

Data Communications and Networking | 4th Edition
A site with 200 subnets has the class B address of 132.45.0.0. The site recently migrated to IPv6 with the subscriber prefix 581E:1456:2314::ABCD/80. Design the subnets and define the subnet addresses, using a subnet identifier of 32 bits.

aaa 1 answered in Computer Networks Jan 6

by aaa 1

54 views

29 votes

12 answers

14

GATE CSE 2019 | Question: 29
Suppose that in an IP-over-Ethernet network, a machine X wishes to find the MAC address of another machine Y in its subnet. Which one of the following techniques can be used for this? X sends an ARP request packet to the local gateway' ... packet with broadcast MAC address in its local subnet X sends an ARP request packet with broadcast IP address in its local subnet

Nitesh_Yadav answered in Computer Networks Jan 5

by Nitesh_Yadav

12.4k views

0 votes

1 answer

15

MADE EASY TEST SERIES
A network of n computers is such that we have m pairs of computers connected using full duplex wired links: a full duplex link is a direct two-way wired connection between two computers. The wired connectivity of a computer is the number of computers ... could be removed without changing any computer's wired connectivity. I wasn't able to think how to solve this question.HELP.

_nirbha_ answered in Computer Networks Jan 5

68 views

1 vote

1 answer

16

Applied Mock Test
Host A is connected to host B with a 100 Mbps link that has a 200 ms one-way latency and transmission delay of 10 sec. How much data can A send to B before B’s first acknowledgement reaches A?

Onika answered in Computer Networks Jan 4

by Onika

77 views

0 votes

1 answer

17

Test Book Test Full Test 7
A message consisting of $2400$ bits is to be passed over the Internet. The message is passed to the transport layer which appends a $150$ - bit header, followed by the network layer which uses a $120$ - bit header. Network layer packets ... network only accepts up to $900$ bits long. The number of bits, including headers delivered to the destination network, is _________.

Yaman Sahu answered in Computer Networks Jan 3

202 views

0 votes

0 answers

18

computer network chepter 8
Given the dataword 101001111 and the divisor 10111, show the generation of the CRC codeword at the sender site using binary division (Modulo 2 Arithmetic) Polynomial method

M.hanan asked in Computer Networks Dec 31, 2021

40 views

40 votes

9 answers

19

GATE CSE 2015 Set 3 | Question: 28
Consider a network connecting two systems located $8000$ $\text{Km}$ apart. The bandwidth of the network is $500 \times 10^6$ $\text{bits}$ per second. The propagation speed of the media is $4 \times 10^6$ $\text{meters}$ per ... . Assume that processing delays at nodes are negligible. Then, the minimum size in bits of the sequence number field has to be ______.

Beyonder answered in Computer Networks Dec 30, 2021

9.3k views

36 votes

6 answers

20

GATE CSE 2014 Set 1 | Question: 28
Consider a selective repeat sliding window protocol that uses a frame size of $1$ $\text{KB}$ to send data on a $1.5$ $\text{Mbps}$ link with a one-way latency of $50$ $\text{msec}$. To achieve a link utilization of $60\%$, the minimum number of bits required to represent the sequence number field is ________.

Beyonder answered in Computer Networks Dec 29, 2021

18.4k views

30 votes

6 answers

21

GATE IT 2005 | Question: 28
Which of the following statements is FALSE regarding a bridge? Bridge is a layer $2$ device Bridge reduces collision domain Bridge is used to connect two or more LAN segments Bridge reduces broadcast domain

sameer_hack answered in Computer Networks Dec 29, 2021

6.9k views

0 votes

1 answer

22

slow start phase self doubt
when no of RTT is asked , i am confused when will start from 1 AND when will start from 2 rest part i known folow until thresold size and then increse with given MSS LET SUPPOSE THRESOLD 20 FOR EX ::: 1 2 4 8 16 20 22 24 26 OR 2 4 8 16 20 22 24 26 in ex 1 no of rtt is 9 while in ex 2 no of rtt is 8 can anyone tell me when we will start 1 and when we will start with 2

adad20 answered in Computer Networks Dec 28, 2021

by adad20

58 views

0 votes

0 answers

23

Test Series: ACE (Networking)
Never done any problem in concept called purging in networking. can anyone tell me how to approach this. is this in syllabus?

ramakrushna asked in Computer Networks Dec 28, 2021

58 views

1 vote

1 answer

24

Applied Mock Test
How Long it will take if a person clicks on a link to retrieve the HTML file referring to 12 objects. We are using the Non-persistent HTTP connection with 6 parallel TCP connections. Assume the transmission time for any file is 0 ms. The round trip time between the person and the sever is RTT ms.?

Vishal_kumar98 answered in Computer Networks Dec 28, 2021

by Vishal_kumar98

88 views

0 votes

0 answers

25

In Computer Networks ,transmission rate means Bandwith or something else?
In Question,if it mentioned as transmisson rate is 80kbps.What do you mean by that?

palsuman97 asked in Computer Networks Dec 27, 2021

39 views

5 votes

2 answers

26

Data communication and networking by forouzan 12.7 Exercise
11. We have a pure ALOHA network with 100 stations. If $T_{fr} = 1 \mu s$, what is the number of frames each station can send to achieve the maximum efficiency. 12. Repeat Exercise 11 for slotted ALOHA.

madhes23 answered in Computer Networks Dec 27, 2021

2.1k views

4 votes

3 answers

27

TCP Congestion control AIMD
Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 KB and the threshold at the start of first transmission is 32 KB. Assume that 3 ... transmission and 1 duplicate ACK received during 6th transmission. what is the congestion window size at the end of 10th transmission?

sachin486 answered in Computer Networks Dec 27, 2021

995 views

0 votes

5 answers

28

confusion -- computer networks
Do we actually need ip and Mac addresses both at same time for the computer for communication? Why we not use Mac instead of ip address since Mac is also the unique address globally? Why we not use ip instead of Mac Since both are unique but why we use both for computer networkws?

Isha_99 answered in Computer Networks Dec 25, 2021

66 views

1 vote

0 answers

29

Made-Easy Test Series
Consider source X and destination Z is connected through an intermediate network Y. X sends a message of 260 bytes of application data to Z. TCP layer at source X prefixes 40 byte header to the message and then IP layer attach 40 byte header. Data link ... are correctly delivered. (Consider 40 bytes IP header at each network). a)400 bytes b)384 bytes c)360 bytes d)424 bytes

webron9 asked in Computer Networks Dec 25, 2021

77 views

0 votes

0 answers

30

Test series question(Aceacademy)
Can someone explain it to me as to why in selective repeat it's not possible for an acknowledgment to come for a packet that falls outside the current window? Because it may be possible that there is some delayed acknowledgment. It's possible ... I feel is not possible because here we are talking about cumulative ack not independent. So how is this reason valid?

Ananya Nayak asked in Computer Networks Dec 25, 2021

by Ananya Nayak

36 views

0 votes

1 answer

31

ACE academy Test series : Computer networks
At a transmission rate of 20Mbps and propagation speed of 2*10^8m/s. How many meters of the cable is one-bit delay in an Ethernet interface equivalent?

Onika answered in Computer Networks Dec 25, 2021

by Onika

53 views

0 votes

1 answer

32

ACE Test series
Need help!

adad20 answered in Computer Networks Dec 24, 2021

by adad20

59 views

2 votes

2 answers

33

MadeEasy Test Series: Computer Networks - Distance Vector Routing

sachin486 answered in Computer Networks Dec 23, 2021

625 views

1 vote

1 answer

34

Applied Mock Test
Consider an IP packet with a length of 2000 bytes which includes a 20-byte header . The packet is forwarded to an IPv4 router that supports a Maximum Transmission Unit (MTU) of 400 bytes. Assume that the length of the IP header in all the outgoing fragments of this packet is 20 bytes. The fragmentation offset value stored in the third fragment is _______.

manishi answered in Computer Networks Dec 18, 2021

65 views

0 votes

1 answer

35

Geeks Quiz
S1 : Loss of ACK from client doesn’t effect on termination of connection. S2 : The client moves FIN-Wait-1 → FIN-Wait-2 → closed in the state machine on no packet loss. S3 : Loss of ACK from server restrict termination of connection. Options Are: S1 and S2 S2 and S3 S1 and S3 S2 only

AngshukN answered in Computer Networks Dec 18, 2021

43 views

0 votes

1 answer

36

Applied Mock Test
The packet is sent from source to router with the link having the maximum transmission unit (MTU) as 480 bytes, the header is of size 20 bytes. The intermediate fragment size is X and the last fragment size is Y when the packet size is of 2000 bytes including the header. Calculate the value of X+Y in bytes?

begonethots answered in Computer Networks Dec 18, 2021

71 views

2 votes

1 answer

37

Applied Mock Test 2
In TCP, MSS is 8B. If during the 6th RTT the network is congested and timeout occurs, by using the congestion algorithm, then the threshold value is _________(in Bytes). (assume initial congestion window size for the first transmission is 1 MSS)

Vishal_kumar98 answered in Computer Networks Dec 13, 2021

by Vishal_kumar98

211 views

0 votes

1 answer

38

Which layer protocol RIP and OSPF are ? And why ?

jugnu1337 answered in Computer Networks Dec 12, 2021

110 views

0 votes

1 answer

39

Applied Test Series
Assume that we are retrieving a HTML base file with 10 embedded objects. Consider X Round trip time(RTT's) are required to retrieve the base file and the objects under non persistent HTTP with no parallel connection, and Y Round trip time(RTT' ... HTTP with 6 parallel connections.Compute X+ Y ? [Ignore the processing delays, closing TCP connection or any other delays].

aaradhana98 answered in Computer Networks Dec 11, 2021

147 views

0 votes

0 answers

40

Computer networking
If the CRC polynomial has degree n then what is the probability of detecting errors greater than n? a) 1/2^(n-1) b) 1/2^(n+1) c) 1/2^n d) 1/2^(n+2)

Anwesha_Mishra asked in Computer Networks Dec 10, 2021

by Anwesha_Mishra

56 views

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