Recent questions and answers in Computer Networks

Recent questions and answers in Computer Networks

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1

Automatic Repeat Request
Consider an ARQ algorithm running over a 20-km point-to-point fiber link. (a) Compute the propagation delay for this link, assuming that the speed of light is 2 × 10^8 m/s in the fiber. (b) Suggest a suitable timeout value for the ARQ algorithm to use. (c) Why might it still be possible for the ARQ algorithm to time out and retransmit a frame, given this timeout value?

seba aburayyan asked in Computer Networks 5 hours ago

by seba aburayyan

10 views

5 votes

3 answers

2

GATE CSE 2022 | Question: 25
Consider the resolution of the domain name $\textsf{www.gate.org.in}$ by a $\text{DNS}$ resolver. Assume that no resource records are cached anywhere across the $\text{DNS}$ servers and that iterative query mechanism is used in the resolution. The number of $\text{DNS}$ query-response pairs involved in completely resolving the domain name is ________________.

Kabir5454 answered in Computer Networks 16 hours ago

2.1k views

71 votes

7 answers

3

GATE CSE 2009 | Question: 58
Frames of $1000\text{ bits}$ are sent over a $10^6$ bps duplex link between two hosts. The propagation time is $25ms$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). Let $I$ be ... before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time) $16ms$ $18ms$ $20ms$ $22ms$

vik_26 answered in Computer Networks 16 hours ago

by vik_26

21.8k views

48 votes

7 answers

4

GATE IT 2008 | Question: 84
Host $X$ has IP address $192.168.1.97$ and is connected through two routers $R1$ and $R2$ to another host $Y$ with IP address $192.168.1.80$. Router $R1$ has IP addresses $192.168.1.135$ and $192.168.1.110$. $R2$ ... $1$ $2$ $3$ $6$

Nirupam Das answered in Computer Networks Jun 13

7.6k views

73 votes

7 answers

5

GATE CSE 2005 | Question: 74
Suppose the round trip propagation delay for a $10\text{ Mbps}$ Ethernet having $48\text{-bit}$ jamming signal is $46.4\ \mu s$. The minimum frame size is: $94$ $416$ $464$ $512$

anupamsworld answered in Computer Networks Jun 13

by anupamsworld

25.5k views

0 votes

0 answers

6

Practice Question | Unacademy
Consider the following statements (I) The two main function of data link layer are data link control and media access control (II) DLL guarantees reliable delivery of packets, hence no acknowledgements required. [A] Only I is true [B] Only II is true [C] Both are true [D] None Please explain your choice.

anupamsworld asked in Computer Networks Jun 12

by anupamsworld

63 views

0 votes

2 answers

7

UPPCL AE 2018:40
If in $\text{CIDR}$ notation an $\text{IP}$ address is written as $172.26.17.1/25$, the subnet mask is: $255.255.255.192$ $255.255.255.0$ $255.255.240.0$ $255.255.255.128$

राजकुमारी विसर्पी answered in Computer Networks Jun 12

by राजकुमारी विसर्पी

372 views

0 votes

2 answers

8

Find total Subnet and hosts
If the IP is 193.1.2.3 and Subnet Mask is 255.255.255.240. How many numbers of subnets and hosts possible in each subnet are: 14,16 14,14 16,14 16,16

computerstudy answered in Computer Networks Jun 7

by computerstudy

69 views

0 votes

0 answers

9

Networking supernet | CIDR
Can these following networks be aggregated to one network? If no then why? If yes then what would be the supernet mask? Network1: 1.2.0.5/24 Network2: 1.2.1.7/24 Network3: 1.2.2.9/24 Please provide descriptive solution.

anupamsworld asked in Computer Networks Jun 6

by anupamsworld

44 views

0 votes

1 answer

10

Updated question of subnet (find decimal value of last octate of last host of sixth subnet)

Kabir5454 answered in Computer Networks Jun 2

37 views

0 votes

0 answers

11

ARP protocol
Assume the network does not support broadcasting.What do you suggest for sending the ARP request in this network?

Kabir5454 asked in Computer Networks Jun 2

35 views

1 vote

2 answers

12

SELECTIVE REPEAT - CN
Window size: 3 Every 3rd packet get lost. Total packet to send: 7 What would be total no. Of transmission? Use selective repeat

abhinowKatore answered in Computer Networks Jun 1

by abhinowKatore

1.1k views

0 votes

0 answers

13

How does non persistent parallel HTTP connections work?
You don't need to read the whole question for answering. Just tell me how non persistent parallel connections work with a figure. The figure that is found in internet for it is the one that is exactly below this but I don't ... different. ( I think I get this now. It is just calculating response time for n objects rather than total RTTs)

shivajikobardan asked in Computer Networks May 31

by shivajikobardan

45 views

1 vote

0 answers

14

Forouzan book :- Throughput of a network
There are only three active stations in a slotted aloha network :A,B,C.Each station generates a frame in a time slots with the corresponding probabilities $P_{A}=0.2,P_{B}=0.3,P_{C}=0.4$ respectively. What is the throughput of each station? What is the throughput of entire network?

Kabir5454 asked in Computer Networks May 28

59 views

0 votes

2 answers

15

slotted aloha
measurements of a slotted aloha channel shows that 20% of slots are idle. 1.what is normalized total traffic in channel? 2.what is normalized throughput?

Kabir5454 answered in Computer Networks May 28

810 views

0 votes

0 answers

16

Forouzan question:- Expected no of empty slots in slotted aloha
A slotted aloha network is working with maximum throughput.How many slots, n, on average, should pass before getting an empty slot?

Kabir5454 asked in Computer Networks May 28

33 views

0 votes

0 answers

17

Collision detection Forouzan book
Assume the propagation delay in a broadcast network is 6 micro seconds and the frame transmission time is 4 microsecond .Can the collision be detected no matter where it occurs ?

Kabir5454 asked in Computer Networks May 27

34 views

0 votes

1 answer

18

Can any one describe this ?
An ISP is granted a block of addresses starting with 188.50.0.0/16. The ISP wants to distribute these blocks to 100 customers as follows. The first group has 30 medium-size businesses; each needs 128 addresses. The second group has ... the subblocks and give the slash notation for each subblock. Find out how many addresses are still available after these allocations.

Kabir5454 answered in Computer Networks May 25

87 views

0 votes

2 answers

19

UGC NET CSE | December 2009 | Part 2 | Question: 30
Match the following : ... $\text{a-ii, b-iv, c-iii, d-i}$ $\text{a-iv, b-iii, c-ii, d-i}$

Shweta1234qwerty answered in Computer Networks May 23

by Shweta1234qwerty

809 views

0 votes

1 answer

20

1. For a 1Gbps link, 10 ms prop. delay, 1000-bit packet, compute the utilization for: a. Stop and wait protocol b. Sliding window (window size=10)

Kabir5454 answered in Computer Networks May 20

36 views

0 votes

0 answers

21

Suppose an ISP owns the block of addresses of the form 131.210.16.0/21. Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. i. What are the prefixes (of form a.b.c.d/x) for the four subnets? ii. What is the number of host address that can be supported per subnet?

Neyoa asked in Computer Networks May 19

by Neyoa

45 views

24 votes

5 answers

22

GATE CSE 2004 | Question: 15
Choose the best matching between $\text{Group 1}$ and $\text{Group 2}$ ... $\text{P-2, Q-4, R-1}$ $\text{P-2, Q-3, R-1}$ $\text{P-1, Q-3, R-2}$

Prateek pallaw answered in Computer Networks May 4

by Prateek pallaw

4.8k views

0 votes

6 answers

23

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?

Sam23 answered in Computer Networks May 3

by Sam23

168 views

0 votes

1 answer

24

Nptel Assignment Question

Sam23 answered in Computer Networks May 3

by Sam23

93 views

1 vote

2 answers

25

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?

Sam23 answered in Computer Networks May 3

by Sam23

185 views

0 votes

1 answer

26

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?

Sam23 answered in Computer Networks May 3

by Sam23

136 views

0 votes

2 answers

27

computer network chapter 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

Sam23 answered in Computer Networks May 3

by Sam23

397 views

1 vote

1 answer

28

Two nodes (A and B) are on the same network, and distanced by 500-meter. The two nodes are connected via 3 switches, each with a delay of 5 µs. Suppose that both of A and B transmit 1500 bytes at the same exact time and their frames collide. A chooses to retransmit immediately after jam signal is received, and B chooses to retransmit after 50 µs of receiving the jam signal. Assume the transmission speed is 10 Mbps, the channel is CSMA/CD with backoff intervals that are multiples of, the jam signal takes 10 µs to transmit, and the inter-frame gap is 9.6 µs. Find the time required to deliver A’s packet to B

Sam23 answered in Computer Networks May 3

by Sam23

187 views

1 vote

2 answers

29

Applied Test Series
For the given network address 178.100.0.0 we need the 2000 subnets and 15 usable hosts then what will be the subnet mask for this allotment ?

Anilsapkal answered in Computer Networks Apr 28

169 views

0 votes

0 answers

30

Do we have token ring in Gate Cs 2023 syllabus ?
In Computer networks, do we have token ring in Gate 2023 syllabus

abhinowKatore asked in Computer Networks Apr 24

by abhinowKatore

77 views

0 votes

1 answer

31

What is the BOOTP port number which is stored in relay agent?

Bharat Bhushan answered in Computer Networks Apr 22

by Bharat Bhushan

68 views

88 votes

18 answers

32

GATE CSE 2016 Set 1 | Question: 54
For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of $1$ $\text{megabyte}$ and the maximum output rate is $20$ $\text{megabytes}$ per $\text{second}$. Tokens arrive at a rate to ... to send $12$ $\text{megabytes}$ of data. The minimum time required to transmit the data is _____________ $\text{seconds}$.

Pranavpurkar answered in Computer Networks Apr 16

by Pranavpurkar

29.7k views

0 votes

0 answers

33

Assume a scenario with 7 nodes and packets that are traversing these nodes are delay sensitive (this means that they have strict deadlines to arrive at the destination).

ro989 asked in Computer Networks Apr 15

by ro989

51 views

0 votes

0 answers

34

PCA1: Write a program to find out the shortest path from a source to a destination node in network which contains 50 nodes. The nodes randomly located in a 500m X 500m area. Every node has transmission range of 20m i,e any node within the 20m around a node is considered as neighbour of the node.

SubhoITm.tech asked in Computer Networks Apr 13

by SubhoITm.tech

30 views

0 votes

2 answers

35

GATE CSE 2022 | Question: 50
Consider the data transfer using $\text{TCP}$ over a $1 \; \text{Gbps}$ link. Assuming that the maximum segment lifetime $\text{(MSL)}$ is set to $60 \; \text{seconds},$ the minimum number of bits required for the sequence number field of the $\text{TCP}$ header, to prevent the sequence number space from wrapping around during the $\text{MSL}$ is ________________.

Bhaskar_Saini answered in Computer Networks Apr 6

by Bhaskar_Saini

850 views

1 vote

1 answer

36

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?

Piyush kothari answered in Computer Networks Apr 3

by Piyush kothari

238 views

0 votes

2 answers

37

NIELIT 2017 DEC Scientific Assistant A - Section B: 25
What is the value of acknowledgement field in a segment Number of previous bytes to receive Total number of bytes to receive Number of next bytes to receive Sequence of zero's and one's

s_dr_13 answered in Computer Networks Mar 31

429 views

1 vote

2 answers

38

NIELIT 2017 DEC Scientific Assistant A - Section B: 49
Why is one - time password safe ? It is easy to generate It cannot b shared It is different for every access It can be easily decrypted

s_dr_13 answered in Computer Networks Mar 31

417 views

0 votes

2 answers

39

NIELIT 2016 DEC Scientist B (IT) - Section B: 31
A set of rules that governs data communication: Rule Medium Link Protocol

s_dr_13 answered in Computer Networks Mar 31

381 views

4 votes

3 answers

40

GATE CSE 2022 | Question: 12
Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below. What is the number of subnets inside the enterprise network? $3$ $12$ $6$ $8$

felics moses 1 answered in Computer Networks Mar 27

by felics moses 1

3.1k views

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